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DALLAS The City of Dallas has hired a law firm from Houston to look into the circumstances surrounding a police escort at the funeral of a cop killer.

Bracewell & Giuliani LLP has been asked to determine if department rules were violated when motorcycle officers were called to escort the funeral procession of David Brown Jr. last Friday.

Investigators say Brown killed Lancaster police Officer Craig Shaw and one other man on Father's Day. Brown was the son of Dallas police Chief David Brown.

Several associations representing Dallas officers have criticized the decision by senior department officials to authorize the motorcycle escort.

There was no word on how much the independent investigation will cost.

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