A suspicious vest that was detonated after a northern New Jersey thrift-store owner thought it resembled a bomb was actually a movie prop, police said.

The explosion rocked a portion of downtown Clifton early yesterday.

Clifton police say the owner of New 4 U on Lakeview Avenue was going through items he bought at a storage auction when he made the discovery.

A six-block area was evacuated Thursday night as bomb-squad members inspected and destroyed the device.

No injuries were reported.