Crews were back on the scene of an apartment complex fire that broke out late Sunday night in Lehighton.

Borough Fire Chief Patrick Mriss said the fire broke out at around 11 p.m. at 256 N. Second St.

Mriss said the structure is a 7-unit apartment building, six of which were occupied with 10 occupants.

Upon arrival, Mriss said firefighters encountered heavy smoke coming from the first floor of the building.

Mriss said firefighters knocked down the fire and continued overhaul of the parts it extended to.

He said the fire took about an hour to get under control Sunday night, and about another two hours for cleanup.

The fire police stayed on scene in 5 degree weather to make sure the building was secured, until just before 5 a.m.

The cause of the fire remains under investigation, Mriss said.

A fire marshal was on scene last night and returned today.

Fire departments called to the scene included Aquashicola, Bowmanstown, East Penn, Franklin, Lehighton, Mahoning, Palmerton, Parryville, Trachsville, Jim Thorpe, Penn Forest, Nesquehoning, Lansford, Summit Hill and Weatherly.

Also called were Lehigh Township in Northampton County, Walnutport, Emerald and Slatedale in Lehigh County and Polk Township in Monroe County.

The American Red Cross was on scene Sunday night to provide blankets, comfort kits, and assistance to the vicrims and returned today to help those who were displaced.

The roads surrounding the buidling were a sheet of ice from all the water used to knock down the blaze.

The fire is close to the site of the blaze that broke out Nov. 24 at three structures on North Second Street that displaced 18 people.

Ron Gower contributed to this report.