Here’s the Sunday open line.

Another senseless slaughter — and again of police officers— leaves many questions but few answers, both about today’s killings and the future.

A couple of notes:

* THE SUSPECT: Here’s a rundown on what’s known about the suspect killed in the Baton Rouge slaying of three police officers and wounding of three more. He is said to be a 29-year-old black man named Gavin Long from Kansas City. According to early accounts, he was an honorably discharged Marine and  a former dean’s list student at Alabama with no known ties in Louisiana and no known criminal record. He’s said to have begun firing “indiscriminately” at police who responded around 8:45 a.m. to a report of a man carrying an “assault” rifle. Despite early confusion, authorities now appear to believe the dead suspect acted alone.


* OPEN CARRY: The Cleveland police union asked Ohio Gov. John Kasich to suspend the open carry law during the Republican National Convention. He said, of course, that laws couldn’t be suspended. Many open carry advocates apparently have been present near the site of the RNC. The presence of semi-automatic rifles gives some — even police — cause for concern. There can be misunderstandings, as with the detention of several open carry advocates in Dallas following police shootings there. Open carry has long been legal in Luisiana, with some restrictions such as school zones, public buildings, places where alcohol is sold and others.

UPDATE: Here’s more insight to the shooter.