Brooklyn Tech evacuated after bomb threat

NEW YORK - Students and staff were allowed to return to Brooklyn Technical High School in Fort Greene hours after a bomb threat was directed at the prestigious school.

The NYPD tweeted just before 9 a.m. Thursday that the school of approximately 6,000 students was evacuated and an investigation was underway.

Photos posted to social media showed thousands of students lined up outside the school. Students and staff were moved to nearby Long Island University to stay warm.

"The NYPD are conducting a sweep of Brooklyn Tech after receiving a threat," said Mayor Bill de Blasio via Twitter. "We're redirecting students and staff to nearby Long Island University in the interim. We will provide updates once we know more."

At 11:22 a.m., the NYPD 88th precinct tweeted that the evacuation was over.

 It was not clear how the bomb threat was made or if anything was uncovered during the investigation.