WATERFORD, Mich. -- Waterford police are warning people who have boats docked on Cass Lake not to leave valuables inside the boats.

The warning comes after a rash of robberies in the past few weeks.

Police said they were called to two separate boat theft reports on Monday and Tuesday on Forest Bay Drive.

Sometime between July 1 and July 3, a Kenwood radio, a subwoofer and a power amplifier were stolen from a Southbay pontoon boat and some time between June 25 and July 5, a radio, an iPod, an FM transmitter and a Black and Decker power station were stolen from a Crownline boat.

Anyone with information is asked to call the Waterford Police Department at 248-674-0351.