On July 5th, police officers in Baton Rouge shot and killed 37-year-old Alton Sterling, who was selling CDs in front of a convenience store.
A friend of Jackson's family, Erika Green, confirmed the posting, which is no longer on Facebook.
Tension has been high since police shot dead a black man in Baton Rouge two weeks ago.
"To me, this is not so much about gun control as it is about what's in men's hearts", said Edmonson, who like some of his colleagues who spoke in the press conference, was clearly shaken. Coppola said authorities are asking people to stay away from the area.
In a live broadcast from the White House, President Obama called upon all Americans to unite and refrain from divisive language.
Obama said in a statement earlier Sunday, "I condemn, in the strongest sense of the word, the attack on law enforcement in Baton Rouge".
He said there was no justification for violence against law enforcement and that the attacks are the work of cowards who speak for no one.
Now the board outside the FOP Lodge also displays a message of support for Baton Rouge, a city that lost three officers Sunday in an ambush on law enforcement.
The shooting began at a gas station on Airline Highway.
Witness Brady Vancel told WAFB TV he saw what may have been gang members shooting at each other before police arrived. The gunman was fatally shot.
"It's my understanding that they (the officers) had responded to an initial shooting incident", Hicks said. The suspect was dressed all in black and, some reports said, wore a mask. Police say he also wounded three officers before he was killed in the latest in a string of violent incidents involving police. Two were Baton Rouge police officers, 32-year-old Montrell Jackson and 41-year-old Matthew Gerald, and one was an East Baton Rouge Parish deputy, 45-year-old Brad Garafola.
The man says that African-Americans are oppressed and questions why white American revolutionaries are praised for fighting their oppressors but African ones are not. USA media citing unnamed sources identified the suspect as Gavin Long, a 29-year-old African American from Kansas City, Missouri whose birthday was Sunday.
Long, who received an honorable discharge, was listed as a "data network specialist" in the Marines.
"We've already asked our officers to make sure that they pair up, be very vigilant 24/7", said Hunt.
Gov. John Bell Edwards told media Sunday afternoon that the gunman committed, "an absolutely unspeakable, heinous attack".
According to the New York Times, Long served in the Marines for five years, from August 2005 to August 2010, and was deployed to Iraq from June 2008 to January 2009.
"Everything's been anti-police", he said, but he insisted the "overwhelming number of people in Baton Rouge" were "not buying into their rhetoric". He said there were no firm numbers on the number hurt or the extent of injuries. It is unclear why Long was in Baton Rouge.
The Black Lives Matter civil rights movement has called for police to end racial profiling, bringing the issue to national attention ahead of the 8 November US presidential election.