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Authorities suspect a propane tank was the source of an early morning explosion among a group of food carts in downtown Portland on Sunday.

PORTLAND RESIDENT DEMANDS ACTION ON HOMELESS CRISIS AS FAMILIES FLEE: 'FORTUNATELY NO ONE HAS BEEN SHOT'

The blast reported at about 3:40 a.m. shattered a large number of windows in the surrounding block, the Portland Police Bureau said.

Officers searched the area but found no one with any injuries.

A blast occurred early Sunday morning in Portland, Oregon.

An explosion occurred around 3:40 a.m. Sunday in Portland, Oregon. There are no reported injuries. 

Area streets were temporarily closed as a bomb squad swept the area for potential explosive devices.