NEW : Three attackers among the dead , city official says . At least 27 killed , more than 100 wounded , according to officials . Fire reduced a building in Lahore to rubble . Car loaded with explosives detonated by building with at least 100 people inside .
NEW : Three attackers among the dead , city official says . At least 27 killed , more than 250 wounded , according to officials . Attack reduces police building in Lahore to rubble . Vehicle packed with explosives detonated by building with at least 50 people inside .