For the second time in as many weeks, an explosive device has gone off in a portable toilet. Pittsburgh Police are investigating this latest one near a construction site on the North Side.

Police were present in the 900 block of Itin Street around 8 a.m. Tuesday with dogs sniffing around the scene. According to police, the call came in around 7, with the incident happening sometime overnight.

“When they got on scene they had discovered that the porta John had evidence of an explosive device that went off inside of the porta John,” Public Safety Assistant Spokesperson Maurice Matthews said.

A construction worker at the nearby site says they came to work to find the portable toilet already destroyed.

Read more: KMOV