The Fire Department is fighting a 3-alarm fire that started just after 5:30 p.m. on the roof of a building at Houston Street and Avenue A. The fire enveloped the entire roof; there is scaffolding on the exterior, and MyFoxNY suggested that the renovation/construction work could have been the culprit.

Here's live video; it appears that the Fire Department has it mostly knocked down (it's not officially under control yet). However, Houston Street is closed between First Avenue and Avenue B.

Update: The fire was at 240 East Houston Street. A few weeks ago, this complaint was filed with the Department of Buildings: "SCAFFOLDING IS BEING INSTALLED ON THE SIDEWALK, THEY HAVE INSTALLED FOUR OF THE SUPPORTS ON THE PROPERTY OF 244 E HOUSTON WITHOUTPERMISSION AND THERE ARE NO PERMITS/PLANS POSTED FOR THE CONSTCTN"

Update: The fire was upgraded to a 4th alarm, because while the main fire was knocked down, there firefighters are still searching for pockets of fire.

Update: The Office of Emergency Management says, "The following street closures are in effect due to the 4 Alarm Fire. E. Houston St. is closed from Christie St. to Norfolk St. Essex St. is closed from Delancy St. to 2nd Ave. The M9, M14 and M21 Buses are being rerouted."

Update: Here's video of the fire from reader Peter: