Two marked police cars were stolen off the streets of Alexandria on successive nights last week, authorities said.

Both of the cars were later recovered, but a shotgun was taken from one, police said.

In the first incident, a 2006 Ford Crown Victoria was taken between Thursday night and Friday morning from the 2700 block of Duke Street. It was parked and locked, police said.

It was later found in Prince George’s County. But a Panasonic Toughbook Mobile Computer and the shotgun, a Remington 870, were missing, police said.

The second cruiser was taken either Friday night or Saturday morning from the 1500 block of Princess Street, police said. The site is on the western edge of Old Town, and about 3 miles east of the Duke Street site.

It was found in Northeast Washington, and nothing was taken from inside, police said.

Many jurisdictions permit officers to take cruisers home at night.

Police said the thefts are under investigation. Detectives are trying to determine whether the cases are related.