A shooter still on the loose claimed at least four lives when authorities say they opened fire on a banquet hall in Stockton, California, Saturday night during a birthday party.

Eleven more people were injured in what the local sheriff called a particularly callous and brutal crime.

"These animals walked in and shot children at a children's birthday party, and none of us should stand for that," Patrick Withrow, the sheriff of San Joaquin County, California, said at a news conference Sunday.

Here's what we know about the shooting so far.

What happened?

At least 100 people were gathered at the birthday party, which was at a banquet hall on the 1900 block of Lucile Avenue in Stockton, when gunfire broke out shortly before 6 p.m.

The attack started inside the banquet hall and spilled o

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