Serial mugger in Manhattan and Brooklyn

September 16, 2011 3:22:37 PM PDT
Police are searching for a serial mugger who is targeting victims in Manhattan and Brooklyn.

Investigators released surveillance video of the man.

He's robbed at least five people since August, most of them teenagers.

The suspect approached the victims and said he thought they were responsible for assaulting his niece, and then robs them.

It's not clear if he has a weapon.