2 Nevada state troopers struck and killed while helping another driver on Las Vegas freeway

Two Nevada state troopers were struck and killed by a vehicle while helping another driver on a Las Vegas freeway Thursday, authorities said. Clark County District Attorney Steve Wolfson said a suspect had been taken into custody hours after the crash, the Las Vegas Review-Journal reported.

"It's a terrible, terrible tragedy to have these troopers lose their lives in the manner they did," Wolfson said.

Las Vegas police, who are investigating the collision, planned to hold a news briefing at their headquarters later Thursday.