KENTWOOD - A series of copper thefts has law enforcement on high alert, with the Tangipahoa Sheriff's Office arresting five people since the start of the month.In the town of Kentwood, AT&T crews stayed parked on the sides of Highway 51, a remnant from Saturday's internet outage.“It’s about 880 feet of line fiber and copper that was taken off the pole, it’s a pretty big undertaking for someone to do that,” Kentwood Police Chief Michael Kazerooni…