(TIME) Violence erupted once again in the troubled city of Ferguson, Mo., as multiple gunshots were fired and police launched dozens of tear gas canisters and a main thoroughfare became a battle zone. At least two people suffered gunshot wounds. Several others were arrested, and the violent night ended with Missouri Gov. Jay Nixon deploying the National Guard to Ferguson.

The city’s school district said all schools would be closed Monday, “due to continuing unrest in some areas of Ferguson, and in the interest of the safety of students and families.”

It was the second night of a state-imposed midnight curfew designed to quell the unrest that has enveloped this St. Louis suburb since Aug. 9, when Michael Brown, a black teenager, was shot to death by Darren Wilson, a white police officer. But trouble flared hours before the deadline Sunday.

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