All clear issued for unsubstantiated threat--UPDATED 5 P.M.

March 12, 2010, 5:15 p.m.

No threatening materials were found in a sweep of the construction site of the New Chemistry Building on Princeton's campus after an unsubstantiated bomb threat was received there the morning of Friday, March 12.

Crews on the site are expected to receive confirmation over the weekend about when they can resume their construction work. University users of the nearby Jadwin Hall and Icahn Laboratory, which the University evacuated as a precaution, are expected to resume their normal activities and work schedules beginning at 5 p.m. Friday.

State, county and local law enforcement authorities completed their search of the construction site around 4:40 p.m. and rendered the area safe as the University's Department of Public Safety continues to investigate the source of the threat.

The University community was notified at 11:20 Friday morning that workers were evacuated from the New Chemistry Building construction site. The University's Department of Public Safety determined early that there was no imminent threat, but the University evacuated Jadwin and Icahn just before noon because of their proximity to the site. Evacuees were asked to assemble inside nearby public buildings, such as Frist Campus Center and campus libraries.

Occupants of Jadwin and Icahn were released to go home around 1 p.m. as law enforcement units from the county and the state arrived to continue the search of the New Chemistry Building throughout the afternoon. Jadwin and Icahn house classrooms, laboratories and academic department offices.

Users of those buildings have been advised to visit the University home page for updates over the weekend. The buildings are located in the southern part of Princeton's campus off Washington Road.