Tampa residents warned serial killer may be at large

TAMPA -- Police in Florida were warning residents in the Tampa neighborhood of Seminole Heights to be on high alert Monday after the shooting deaths of three people with no apparent links to each other.Police think the deaths could be the work of a serial killer, and they're warning residents not to walk out alone at night.CBS News' Nikki Battiste reports that residents in the Tampa neighborhood lit candles at a vigil and walked in remembrance on Sunday night for the three people who have been g