MANILA (3rd UPDATE) - A portion of the Skyway Stage 3 in Pandacan, Manila collapsed under the heat of a massive fire that struck at a nearby warehouse, Saturday.

A still undetermined length of the overhead roadway gave way as the blaze raged at a packing factory of San Miguel Corp. on Tomas Claudio Street, Pandacan, Manila.

The affected portion is on a part of the Skyway still under construction.

"It's a portion of Skyway Stage 3 parapet that was damaged. Stage 3 is still under construction and therefore, not operational. We are still assessing the extent of damage," said Skyway Corporate Communications head Marlene Ochoa in a statement.

The fire broke out at 10:36 a.m., with Task Force Bravo, the fifth highest fire alarm, raised at 11:05 a.m.

Firefighters declared that the fire had been put out at 4:10 p.m., or nearly 6 hours since it started.

San Miguel Corp., the firm leading the Skyway project, said it is "ready to provide assistance to anyone directly affected by the incident."

"We also extend our full support and cooperation to authorities as they investigate the cause of the fire," the company said in a statement.

- Report from Bianca Dava, ABS-CBN News