Mashable is following the latest from Ferguson, where protesters and police are squaring off over the killing of 18-year-old Michael Brown. See Monday's live coverage here.

3 things you need to know on Tuesday, Aug. 19:

Missouri Gov. Jay Nixon calls for "vigorous prosecution" in Michael Brown's death. St. Louis County police said they arrested 47 people overnight, seized three guns. U.S. Attorney General Eric Holder sends message to Ferguson; grand jury to convene Wednesday.

REPORTERS IN FERGUSON, Mo.: Amanda Wills (@amandawills), Ashley Codianni (@AshleyCodianni) | EDITORS IN NEW YORK, SAN FRANCISCO, TORONTO, AUSTRALIA: Brian Ries (@moneyries), Jonathan Ellis (@jonathanellis), Kate Sommers-Dawes (@ekatesd), Anita Li (@neeeda) , Jenni Ryall (@jennijenni)