Police officers were shot in separate incidents Friday night in Philadelphia and Fort Worth, Texas.

Two officers were injured — one critically — and the suspect was killed in Fort Worth, while two officers and four civilians were hit in Philadelphia before the suspect was killed.

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The Philadelphia incident began when a man walked up to an officer on the street and opened fire, according to NBC Philadelphia . The suspect then shot four civilian passers-by as he was chased through the streets.

A second officer was then shot when the suspect was chased into an alley, at which point the suspect was shot.

Philadelphia Police Commissioner Richard Ross said a letter found at the scene contained an anti-policed message, specifically naming a parole officer as a target.

The two officers shot in the incident were up and talking Saturday morning. But two of the civilians shot were still in critical condition, having been shot in the chest.

In Fort Worth, the two officers were responding to a suicide call at a house, according to NBC Dallas-Fort Worth

They arrived to find a person unresponsive with a gunshot wound, and were told that a witness was in a backyard shed, so they tried to make contact with that person.

A suspect inside the shed began shooting when they arrived. One officer was in critical condition after being shot several times, while the other had only minor injuries.

SWAT officers surrounded the shed, firing tear gas. They eventually confirmed the suspect inside was dead.

Just arrived in Texas - have been informed two @fortworthpd officers have been shot. My thoughts and prayers are with them. — Donald J. Trump (@realDonaldTrump) September 17, 2016