A person was critically injured Tuesday after jumping from the fourth floor of a burning building in Williamsburg, Brooklyn.The Bomb Squad was called, and a block on Keap Street was temporarily evacuated.Late morning kitchen fire in Williamsburg buildingThe fire started around 11:30 a.m.FDNY officials said the late-morning kitchen fire forced one person inside to take drastic action."It's not uncommon for the conditions surrounding," FDNY Deputy Assistant Chief Joe Duggan said.