Halifax police want the public's help to identify a man who was going door to door in Dartmouth asking residents about alarm systems.

The man was seen in the area of Topsail Boulevard and Dorothea Drive over the past two weeks.

On Thursday at 4 p.m., police got a report that he spoke to a 17-year-old girl at Topsail Boulevard home and asked her to go for a drive with him.

When the girl told him no, he tried to grab her arm and pull her out of the doorway, but she closed the door on him and called the police.

The man is described as about 20 to 30 years old, white, five-feet-nine to five-feet-11 in height with light brown hair. He was wearing a black hoodie, blue jeans and sneakers.

Anyone with information about the (man's) identity is asked to contact police at 902-490-5016. Anonymous tips can be sent to Crime Stoppers by calling toll-free 1-800-222-TIPS (8477), submitting a secure web tip at www.crimestoppers.ns.ca or texting a tip - Tip 202 + your message to 274637.