Baton Rouge shooting: 3 officers dead; shooter was Missouri man, sources say

(CNN) – A Missouri man ambushed and killed three law officers and wounded three others in Baton Rouge on Sunday during a time when police nationwide and in the Louisiana city in particular have been on high alert after five officers were killed in a Dallas ambush July 7.

Louisiana State Police announced last week that they had received threats of plots against Baton Rouge police.

On Sunday, a man identified as Gavin Long of Kansas City went on a shooting rampage on his 29th birthday that left two police officers and a sheriff’s deputy dead, police sources said. Long, who was African-American, was a former Marine who spent time in Iraq and was discharged at the rank of sergeant in 2010, according to the U.S. military.

Police officers who responded to Sunday’s shootings killed Long in a gunbattle after the other officers were ambushed, police sources told CNN. The murder weapon was an AR-15 style semi-automatic rifle, law enforcement sources told CNN.

Police have not officially released the names of the victims but one was identified by family members as Officer Montrell Jackson. Law officers Matthew Gerald and Brad Garafola were also killed, according to sources close to the department. That was corroborated with social media posts.