A violent act on New Year’s Day allegedly committed by a tourist highlights rising tensions between the island and the mainland United States.

The Bureau of Alcohol Tobacco and Firearms served a search warrant on quiet Bramblewood Drive in St. Peters Tuesday looking to solve a series of arsons 2,000 miles away. A neighbor recorded video of the ATF after doing a little online sleuthing of her own.

Federal authorities executed a search warrant Tuesday in St. Louis in connection with an investigation in Puerto Rico of a tourist accused of setting businesses on fire last week. A hotel building's owner described the events as a "nightmare —then step by step you’re hit with the reality amid the screams.

"I think one of the messages I want to send is, Puerto Ricans wherever we're at, we're here. We're going out to watch out for our people and for Latinos," Velázquez told 5 On Your Side. "Really, the audacity of any tourist to come in,