The man police say shot and killed a Fargo police officer and shot two more officers and another person used a “binary trigger” device ... the attack on July 14, according to North Dakota ...

The July 14 shooting in Fargo ... one of them — the one he picked to go on his shooting rampage — had a binary trigger. Here’s a look at the device, regulations around binary triggers ...

The July 14 shooting in Fargo ... one of them — the one he picked to go on his shooting rampage — had a binary trigger. A binary trigger is a modification that allows a weapon to fire one ...