A massive fire broke out early Monday morning in downtown L.A. in a large apartment complex, engulfing an area the size of a city block, damaging adjacent buildings, and shutting down nearby freeways.

The L.A. Times reports:

Flames could be seen for miles from the fire that broke out in the DaVinci apartment complex about 1:20 a.m. The blaze closed roads and freeways, including the 110 North, which won't open until at least 9 a.m., officials said.

More than 250 firefighters battled the blaze at the apartment tower under construction in the 900 block of Fremont Avenue, Los Angeles Fire Department spokesman David Ortiz said. The building had 1.3 million square feet of floor space, and officials said two-thirds of it was consumed by flames.

The fire was so intense, nearby freeway signs melted.

The bulk of the fire was put out in 90 minutes, but firefighters continued to deal with hot spots as of 8 a.m., according to LAFD Chief Ralph Terrazas.

No injuries have been reported and so far the cause of the fire is not known. An L.A. Fire Dept spokeswoman told reporters that an accelerant-sniffing dog had been brought in to help with the investigation.

Map, image via L.A. Times.