LARGO, Fla. (970 WFLA) - As many as 300 people were evacuated from the Mary Grizzle office building in the 11000 block of Ulmerton Tuesday afternoon after people started smelling something strange and feeling sick.  Three people were transported to the hospital, eight were treated on scene.

Witnesses told police a man walked in to a first floor office in the building carrying a backpack and then walked out. Police are looking for the man.  

The building houses government offices like the Department of Children and Families and the Department of Corrections.