time. the cause is still under investigation. those scaffolds are on what seems like on every manhattan block. eric: well, meanwhile, the hunt for a suspected serial killer continues in tampa, florida. there have been four murders in the last six weeks on the streets of one neighborhood. the latest just days ago, and still authorities have no suspect. tampa police have been out in full force, they've been checking cars, going door to door and gathering any evidence they can in hopes of trying to track down the murderer, but as bryan llenas reports, it's been a challenging process so far, and bryan is live here in new york. >> reporter: hi, eric. two dozen detectives are on this case. police have received over 2300 tips and yet still no suspect named as a possible serial killer remains on the loose. police have been canvassing the seminole heights neighborhood in tampa, florida, where three people were murdered in a 10-day stretch in october. but despite the extra patrols and security, the suspected killer managed to murder a fourth person on tuesday.