Dallas police chief David Brown, front, and Dallas mayor Mike Rawlings, rear, talk with the media during a news conference in Dallas. (AP Photo/Eric Gay) 

Dallas police chief David Brown, front, and Dallas mayor Mike Rawlings, rear, talk with the media during a news conference in Dallas. (AP Photo/Eric Gay)

The day after five Dallas officers were killed by a sniper, the city’s police chief described the men as “guardians” of democracy, praising them for protecting the freedom to protest at a large demonstration against police brutality.

President Barack Obama later eulogized the slain officers, saying they died while defending essential constitutional rights.

But nearly two months after the shootings, Dallas police have moved to silence critics and squelch lingering questions about the attack. Officers in riot gear have been told to ticket protesters who block or disrupt traffic, and Police Chief David Brown has refused to meet with demonstrators unless they agree to end their marches through downtown, which he says pose a threat to officers.

Authorities have also refused to release even the most basic information about the slayings, including any details about the weapons used, the autopsy findings and ballistics tests that could establish whether any officers were hit by friendly fire. Police have indicated that such information could be withheld almost indefinitely.

In addition, the police department’s most vocal, visible critic — a 27-year-old self-styled preacher with a criminal history — has been arrested multiple times in the last month on warrants that include unpaid traffic tickets and attempts to revoke his probation from a 2009 felony. On Friday, Dominique Alexander was ordered to prison.

“Why all of a sudden are we the target?” asked Damon Crenshaw, vice president of the Next Generation Action Network, which organized the July 7 protest. “We’re not protesting because we’re mad at them. We’re protesting because the problems still exist and they won’t talk to us.”

Crenshaw said Alexander was targeted because of his protest activities and that the shooter, Micah Johnson, was not affiliated with their group.

Dallas has a history of cracking down on protesters.

Caption2: Dominique Alexander poses for a photo at his apartment in Dallas. Alexander, a leader of the protest where a sniper killed five law enforcement officers in Dallas was ordered to prison Friday, Aug. 26, 2016, for unrelated probation violations. (AP Photo/LM Otero) 
Caption2: Dominique Alexander poses for a photo at his apartment in Dallas. Alexander, a leader of the protest where a sniper killed five law enforcement officers in Dallas was ordered to prison Friday, Aug. 26, 2016, for unrelated probation violations. (AP Photo/LM Otero)

During the Occupy Dallas demonstrations in 2011, the city tried to require protesters to have a $1 million insurance policy, strengthened rules against camping in the city and eventually evicted campers from City Hall in a midnight police raid.

In 2013, the city cited a decades-old rule prohibiting holding signs within 75 feet of major roadways to stop a group that planned to protest the opening of the George W. Bush Presidential Center. The city settled a lawsuit from that group before changing the law to prohibit protests on overpasses and other areas near highways. Another group sued over that law leading to another settlement, and the city repealed the rules all together.

 

Alexander, the founder of the protest network, believes he was targeted because he refused to stop the demonstrations.