Bob McCulloch

Some witnesses called it a tussle. Others described it as a tug-of-war.Ferguson Officer Darren Wilson testified that they were fighting over his handgun.

Attorneys for Michael Brown’s family vowed Tuesday to push for federal charges against the Ferguson police officer who killed the unarmed 18-year-old, and they renewed calls for peace following a night of violent protests in which several businesses burned to the ground.

Less than two weeks after Officer Darren Wilson fatally shot Michael Brown, Senator Jamilah Nasheed of Missouri wrote a letter to Prosecuting Attorney Bob McCulloch urging him to appoint a special prosecuting attorney for the case.

Crews erected barricades Saturday around the building where a grand jury has been considering whether to indict the Ferguson police officer who shot and killed Michael Brown, even as a grand jury decision seemed unlikely this weekend.

The St. Louis region is on edge in anticipation of an announcement from the grand jury that is weighing whether to charge police officer Darren Wilson in the killing of 18-year-old Michael Brown.