By John McDevitt, Diana Rocco

UPPER Darby, Pa. (CBS) — Upper Darby Township police are looking for a man suspected of attempting to lure children in four separate incidents over the past three weeks.

Police say the latest incident happened shortly before 7 a.m. Tuesday morning at Radbourne Road and Church Lane in the Stonehurst section of Upper Darby.

According to Police Superintendent Michael Chitwood, a man in a dark green mini van, possibly a Chevy Montana, approached a boy as he was en route to school and ordered the boy to get into the vehicle. The boy refused and the man drove off.

“It’s a white male in his 50s, dark hair heavy built, he may have some salt and pepper facial hair,” Chitwood described.

Police say on March 5th at Huey in Brookfield in Drexel Hill, a man allegedly drove slowly next to an Upper Darby high school girl exposing himself.

Another, officials say, happened nearby on February 23rd at Forrest and School Lane where a man exposed himself to a girl there.

The fourth luring incident, police say, happened on February 19th at a playground at Highland and Derwin were four boys were approached by a man on foot.

None of the children went with the man.