A file photo of Division Avenue High School in Levittown....

A file photo of Division Avenue High School in Levittown. (March 2, 2012) Credit: Newsday.com Staff

Two Levittown schools were on lockdown for three hours Monday during a police standoff in which a nearby resident refused to let in officers who had been asked to check on his welfare, Nassau authorities said.

The situation began shortly after 8 a.m., when officers responding to a 911 call of a man acting suspiciously knocked on the door of his Carriage Lane home -- only to have a man refuse to open the door or to come out to talk, police said. The man's name had not been released Monday night.

Believing him to be a danger to himself and others, the department sent in crisis negotiators, emergency services police and special operations units. Police cordoned off the area around his home.

The crisis ended about 3 p.m., when the man, 62, was removed and taken to a nearby hospital for medical evaluation, police said.

There were no injuries and no one else was in the house, police said. No weapons were recovered.

A spokeswoman for the Levittown school district said lockdowns at Division Avenue High School and Summit Lane Elementary School were declared at 11 a.m. and lifted shortly before 2 p.m.With Ellen Yan

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Filings: 7-year-old was left home alone for a day 6 months before she died ... LI employers stole nearly $4M from their workers ... Flock reps meeting with Suffolk lawmakers ... Wet weather on the way

Commack park honoring breast cancer survivors opens ... Preview of Billy Joel's bikes ahead of auction ... Yanks swept out of ALDS Credit: Newsday

Filings: 7-year-old was left home alone for a day 6 months before she died ... LI employers stole nearly $4M from their workers ... Flock reps meeting with Suffolk lawmakers ... Wet weather on the way

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