Grain Valley police have some advice: Locked doors prevent crimes.

Police say three residential burglaries occurred south of Eagles Parkway from Aug. 5 to Aug. 11. In each case, the burglar went through an unlocked back door while the residents were asleep. The burglar or burglars have taken laptops, TVs and other items.

Assistant Police Chief David Starbuck said there was rash of vehicle break-ins earlier this summer – and the common denominator then as now is unlocked doors.

Police say criminals will often test doors to see which are unlocked and theft is the easiest. Police say to lock household doors, garages and vehicles.

The residential burglaries remain under investigation, and anyone with information is asked to call Grain Valley police at 816-847-6250.

Earlier this week, a security company called SafeWise rated Grain Valley among the safest cities in the state. Looking at Missouri’s 446 cities of 4,000 or more and drawing from FBI crime data from 2012, the city ranked No. 26 statewide and second in Jackson County. The city had 2.32 violent crimes and 17.88 property crimes per 1,000 residents, according to SafeWise.

Ballwin, a St. Louis suburb, ranked No. 1. Others in the Kansas City area were No. 6 Greenwood, No. 9 Pleasant Hill, No. 11 Smithville, No. 28 Kearney, No. 29 Raymore and No. 30 Platte City. Lee’s Summit was No. 41.