Probe into collapse of US east coast’s main north-south road after tanker fire

The collapsed section of the road as crews continue to work on the scene (WPVI-TV/6ABC/AP)

An investigation was under way on Monday into why a tanker fire collapsed a section of the US east coast’s main north-south road, throwing hundreds of thousands of morning commutes into chaos and disrupting commerce for untold numbers of businesses.

Interstate 95 in Philadelphia, Pennsylvania, will be closed in both directions for weeks at the start of the summer travel season.