THREE parked cars had their windows smashed and valuables stolen by thieves in three different locations.

On Sunday evening, a man in his mid-30s had about $400 worth of items stolen from his car at the open carpark at Block 359, Clementi Avenue 2.

He parked it there overnight and returned the next morning to find his front passenger window smashed and his cellphone, Bluetooth headset and a pair of sunglasses missing.

On Monday morning, a man in his mid-40s parked his car at an open carpark along Carpenter Street at about 10.35am and returned at 1.30pm to find the rear left passenger window smashed. Missing from his car were a briefcase containing office documents.

In the third break-in, a man in his mid-50s had electronic items stolen from his parked car along Kallang Road on Monday morning.

He had parked his car at about 10am and returned at noon to find the rear left passenger window smashed.

Items including two laptops - one worth $1,200 - a camera worth $270 and camera accessories worth $100 were missing.

Police advise the public not to leave valuables exposed in their vehicles and to lock it away in the boot instead.

Witnesses can call the police hotline at 1800-255-0000.