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Here’s what you need to know:

Deadly mass shooting at California bar

At least 12 people, including a sheriff’s deputy, were killed late Wednesday in a shooting at a country and western dance hall in Thousand Oaks, Calif., officials said.

The gunman is also dead, officials said, adding that there was no longer a threat to the public after the shooting at the dance hall, the Borderline Bar and Grill, which was holding an event for college students.

• The location: Thousand Oaks, a relatively affluent city in Ventura County, is about 40 miles northwest of downtown Los Angeles.

Critic of Russia inquiry now oversees it

President Trump replaced Attorney General Jeff Sessions on Wednesday with Matthew Whitaker, who has questioned the scope of the special counsel’s investigation into Russian interference in the 2016 presidential election.