5 police officers have been killed by sniper fire in Dallas, following protests against a spate of shootings by US police of black men.
6 other police officers were wounded in the attacks.
Three people have been arrested and police have been involved in a standoff with a further armed man.
Dallas police say they believe the suspects were working together to attack officers while the demonstration was underway.
Cathy was at the protest when the gunfire started.
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