Thieves broke into postal vehicles and stole packages and mail in a recent string of robberies in the Chicago Lawn neighborhood.
Police said the thieves broke in while the vehicles were parked and unattended.
Incident times and locations:
5300 Block of West 64th Street, on September 14, 2015 at 12:40 p.m.;
5400 Block of South Sayre Ave, on September 14, 2015 at 13:20 p.m.;
7900 Block of South Christiana Avenue on September 22, 2015 at 12:30p.m.;
and 6000 Block of West 56th Street on September 28, 2015 at 12:00 p.m.
Authorities are asking resident to keep the perimeter of their property well-lit, notify police if they see suspicious activity, and check any surveillance video near the locations above.
To report information, call area central detectives at 312 747-8382.