Nassau County offered a reward of up to $35,000 Friday for information leading to the arrest of the man suspected in a string of 10 armed robberies during the past three months at local gas stations, including one in which the clerk was killed.

"Our resolve is intact. It has not diminished. We are going to catch this guy," Chief of Detectives Kevin Smith of the Nassau County Police Department said at a news conference. He spoke at the BP Gas Station on Jericho Turnpike in Jericho, where clerk Hany Awad, 56, was fatally shot during a robbery on Jan. 28.

Smith and other officials stood in front of a mobile billboard that asks the public for help. It will be driven through the county in an effort to reach anyone who has not heard about the robberies from newspapers, television and other news sources.

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"Hopefully, going up and down the streets, people . . . will see this billboard," Smith said.

The suspect is a man between 20 and 25 years old, 5-foot-11 to 6 feet, with a thin build, wearing all-black clothing -- including Nike sneakers with red laces -- a black mask and black gloves.

Smith said Crime Stoppers paid for the billboard and is offering up to $10,000 for information about the robberies and $25,000 for information in Awad's slaying. The Crime Stoppers hotline is 800-244-8477.

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The first of the robberies took place at the Citgo Gas Station in Westbury on Dec. 20. The most recent was Feb. 8 at the Shell Gas Station on Jericho Turnpike in Jericho.

The suspect uses either a black or silver revolver, Smith said.

The wanted poster reads: "Subject entered all locations confronting victims at gunpoint while making verbal demands for money. Victims fearing physical injury complied. Subject takes Newport cigarettes before fleeing on foot."