DALLAS - The Thursday night sniper attack on Dallas police officers during a protest over police-involved shootings was "well planned," Police Chief David Brown said during a midday citywide prayer service here.

"We won’t rest until we bring everyone involved to justice," he said, to a roar of applause.

UPDATE: Crowds line up to hug police officers in Dallas 

Hundreds of people packed Thanks-Giving Square Park for the service, which included prayers, music, tears and tributes.

Brown spoke only briefly, saying he had to leave promptly to return to the investigation, but began his remarks by saying police work is a job where you seldom hear the words "Thank you."

The crowd responded with a deafening THANK YOU!

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Prosecutor Skandalakis has previously suggested that pursuing criminal charges against President Donald Trump may not be feasible until after he leaves office in 2029. (Craig Hudson/Politico/Bloomberg via Getty Images)

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