Attorney General Eric Holder Jr. met with community groups and law enforcement Wednesday in Ferguson, Mo., urging cooperation to reduce tension after days of clashes between police and protesters.

Holder arrived Wednesday morning for a briefing on the investigation of the Aug. 9 fatal police shooting of 18-year-old Michael Brown. Police, earlier, had arrested dozens of people amid the demonstrations over the shooting of he unarmed teenager. Unlike other nights, however, police on Wednesday did not fire tear gas, according to press reports.