DANBURY — A massive police presence was seen on Franklin Street on Tuesday afternoon as authorities searched for at least one robbery suspect. No details were immediately available, but the search kept residents out of the area for part of the afternoon. Franklin Street was temporarily closed at 2 p.m. between Raymond Place and Main Street. State troopers, an ambulance and SWAT officers were in the area assisting Danbury police. SWAT officers began searching the train tracks about 3 p.m.