Transcript for Major Cities See Spike in Tech Theft
In chicago tonight, a stunning milestone to mark year's end. 500 homicides. Near a record high which they attribute to gun violence, lowest in more than 40 years. The new york crime rate is 414 that's the lowest. Michael bloomberg talked about the crime numbers for the year, one reason for the spike in thefts is the iphone. It's part of an expending robbery epidemic, apple taking. This surveillance video shows a thief sneaking up on her and putting her in a head lock. New york major michael bloomberg said that iphone thefts are single-handedly driving up the city's crime rate. If you just took out the thefts of apple products, our total crime rate would be lower than it was last year. Reporter: In new york city alone, iphone thefts have spiked 30%. More than 16,000 snatched. And in washington, d.C., Police told our pierre thomas, they make up nearly 40% of all robberies. They target those who are more vulnerable, women, women with baby carriages. Reporter: Police have stepped up awareness. In las vegas, there's a psa announcement with the voice of siri. I really don't enjoy being stolen. Reporter: They're registering cell phones so owners can be contacted. You can download a free app that allows you to remotely lock your phone and wipe all of the information off just in case it gets into the wrong hands. David, we know how important that is with all of personal information we have it. Some good news to report tonight about former president
This transcript has been automatically generated and may not be 100% accurate.