An Editor’s Note published July 12, 2017, about Kevin Deutsch’s reporting appears at the end of this story. 

The FBI has joined the hunt for a gas-station robber who has struck 15 times on Long Island since August -- a spree that has instilled fear in station clerks and motorists alike, officials said at a news briefing Friday.

Nassau police said the FBI was brought in to assist on the case because of the department's close relationship with the agency, and because the robber potentially faces federal firearms charges stemming from the heists.

The casually dressed, calm-looking suspect is seen on surveillance videos unhurriedly entering businesses throughout Nassau and Suffolk counties, always clutching a black, semiautomatic handgun covered by a cloth.

In each heist, the robber calmly walks toward the register, displays his gun and demands cash from a store employee. There are no customers present in the videos, leading detectives to speculate that the robber cased each station before entering.

"He's very cool, he moves very slowly," Det. Lt. Kenneth Catalani, commanding officer of Nassau's robbery squad, told reporters at police headquarters in Mineola.

The robber tells his victims to "give me the money, give me the money fast," according to police.

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"He's very demanding, and they move quickly," Catalini said.

In addition to publicizing new details of the crimes Friday, authorities released several pictures and videos taken during the robberies, and announced a $15,000 reward for information leading to an arrest.

Police in both counties also said they are increasing patrols of gas stations.

"These pictures that we have now are really probably the best evidence we have to solve this quickly," said Suffolk police Deputy Insp. William Doherty, whose agency is working with both Nassau police and the FBI to catch the robber.

The unidentified man has targeted gas stations across a 60-mile span, from Elmont to Riverhead, always leaving detectives one step behind. There is no geographic pattern to his crimes, police said, and investigators have not been able to determine whether he uses a vehicle.

"The breadth of the area is a dynamic that makes it more difficult," acting Nassau Police Commissioner Thomas Krumpter said.

Nassau police said the series of robberies began with a BP station holdup Aug. 4 in Hempstead, while the latest robbery occurred Wednesday at 10:38 p.m. at a Mobil station on Old Country Road in Westbury -- the ninth heist thought to be carried out by the robber in Nassau.

In Suffolk, police believe the same man also is responsible for at least six armed gas-station robberies.

Acting Nassau District Attorney Madeline Singas said the crimes were particularly disturbing because of how dependent residents are on automobile travel -- and the workers who fuel their cars.

"It's scary, of course," Raji Singh, an attendant at a BP station on Jericho Turnpike in Mineola, said Friday. "They need to catch this guy." Police have not said how much money was stolen in the Nassau robberies, but Suffolk police said the suspect has taken between $500 and $850 in each of the heists there.

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Anyone with information about the suspect is asked to call Nassau Crime Stoppers at 800-244-TIPS. Suffolk police also have asked anyone with information to call Suffolk Crime Stoppers at 800-220-TIPS.

All calls will remain confidential, police said.

With William Murphy

Editor’s note: Newsday undertook an extensive, four-month review of reporting by Kevin Deutsch, who covered law enforcement from April 2012 to September 2016. 

The review of the former Newsday reporter’s work began after The Baltimore Sun this year reported that law enforcement and other officials questioned the veracity of Deutsch’s nonfiction book “Pill City” about Baltimore’s drug trade. In addition, questions arose about individuals named in Newsday stories by Deutsch. Book publisher St. Martin’s Press and Deutsch have said they stand behind the book. 

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We are dedicated to accurate, factual reporting, to the highest journalistic standards and to maintaining our credibility with Newsday readers. We also are committed to being accountable to our readers. Newsday undertook the detailed review in that spirit and because of the concerns that were raised.  

In late February, as our review was under way, The New York Times reported in an editor’s note that The Times “had been unable to locate or confirm the existence of two people who were named and quoted” in a Dec. 29, 2016, freelance article written by Deutsch. Deutsch “maintains that the interviews and the descriptions are accurate,” The Times wrote. 

Newsday reviewed 600 stories with reporting by Deutsch. We contacted officials in the police departments regularly involved in Deutsch’s coverage. They said they had not had problems with his work. We then focused our research and reporting on individuals who, as described in the stories, would not be considered officials, or well-known, public figures. 

The review found 77 stories with 109 individuals from Deutsch’s reporting whom Newsday could not locate. The main points of the stories were not affected. While two stories about the Orlando nightclub shooter Omar Mateen were based on sources Newsday could not locate, other media reported the main points of those stories but with attribution from different sources.  In this story, Newsday could not locate: Raji Singh. Newsday is attaching an editor’s note to each story online that contains individuals we cannot locate.  

Here’s how Newsday conducted the review:  

Researchers and reporters searched local and national public records, sites providing nationwide people searches, databases of business, real estate and conviction records, social media sites including Facebook, LinkedIn and Ancestry.com and nationwide news archives. They searched potential alternate spellings and other name variations. Their reporting followed potential leads they found through research, within stories and in information shared by Deutsch during the review. 

Finding people after publication, in some cases years later, can be difficult because of changes in residence, circumstance and contact information. Some may not have given their real names. 

On the law enforcement beat, reporters may encounter people who lead lives that are not reflected in public records or other sources of information that would help locate them. It is possible that some on our list were difficult to find or reluctant to respond to our review because they are undocumented immigrants, those battling or recovering from addiction or people involved in or around illegal activity.  

Some on our list were described discussing crimes in their neighborhoods, and others as relatives, friends or neighbors of victims or as individuals living near or knowing those accused of crimes. 

Others we have not been able to locate, though, are described as bystanders, neighbors, spectators, relatives of drug victims, witnesses to news events or related in some way to people in the news. Still others are described in stories as people actively engaged in public issues, such as activists, protesters and marchers. Many individuals on the list are described as local. 

Deutsch said in email exchanges with Newsday that “I have no doubt about the veracity of the claims of the sources I quoted.” He also said, “Not a single public official, source, or other interviewee has raised any issues with even one of these stories.” 

“It's impossible for any reporter to know whether the name given to him by interviewees on the street--or those reached briefly by phone or email-- is that person's full and legal name, rather than an alias or variation of their real name (maiden names and certain common nicknames/abbreviations for first names are often published by newspapers, including Newsday.). But every one of the names on Newsday’s list was the name given to me by that interview subject, verbatim.” 

During the four months of our review, Newsday shared questions and updates with Deutsch as we progressed in the search for individuals we could not locate. We requested notes and contact information. Deutsch sent us notes he said represented all individuals we were unable to locate and responded over the course of the review by email, sharing information he said was from his recollection and notes. 

Reporters followed up on all information shared by Deutsch. He did not provide contact information for those on our list. Newsday reporters and editors sought unsuccessfully several times to meet with Deutsch to discuss his reporting and to review his notes together to ensure we were not missing contact information or other details that might help locate individuals. Deutsch maintained that the notes he shared “serve as evidence of interviews” with each source.  

Deutsch said he kept contact information in a Rolodex he left behind at Newsday’s main office and in a company-issued cellphone he returned within a week after resigning on Sept. 6, 2016. Editorial staff did not find a Rolodex or other notes at our office, but found notes left at Newsday’s desk at a courthouse pressroom where he worked. We shared them with Deutsch and he confirmed they were his. As per company policy, the contents of the cellphone had been deleted immediately after Deutsch returned it to Newsday. 

Maintaining the trust of our readers is essential to our mission.  If we are able subsequently to locate any individuals, we will update our stories.