6 killed, at least 12 injured in mass shooting in Sacramento, California: Police

Investigators are interviewing several witnesses and sifting through hundreds of pieces of evidence, Lester said.

The shooting came just several hours after one person was killed and 10 people were injured when gunfire erupted at an outdoor concert in Dallas, Texas.

The Sacramento shooting broke out about 2 a.m. near the corner of 10th and K Street in a popular nightlife area, Sacramento Police Chief Kathy Lester said at a news conference.

Lester said police officers were in the area and heard the gunshot.

"We had a large crowd in the area. We don't know if it was part of a club or an event," Lester said.

She said officers immediately responded and began providing medical aid to victims.

In a statement Sunday afternoon, police said six people were fatally shot and another 12 were injured and taken to hospitals.

"My son was a very vivacious young man, fun to be around, liked to party, have fun, smiling all the time, didn't bother people. For this to happen ... it's crazy,"

Sergio Harris