On any ordinary day, the South Vancouver neighborhood bustles with the sounds of life, but Saturday was no ordinary day. It was a celebration of Filipino culture, and music from a live concert echoed through the streets as families lined up at food trucks and children played.

On Sunday it was strangely silent.

“It gives me chills,” said Franchesca Gabo, taking it all in.

Ms. Gabo, 20, left the festival shortly before a driver rammed his SUV into the mass of people, killing 11 and injuring more than 30.

Now, she had come back, joining an impromptu vigil of people peering over police tape and trying in vain to absorb the enormity of what had happened.

“It was a happy day yesterday,” Ms. Gabo said. “Everyone was celebrating.”

The authorities say the motive for the attack did not appear to be terrorism. But beyond that little had emerged about the suspect in custody other than that he is a 30-year-old man with a history of mental illness. Now, he is charged with murder.

More was becoming known about the victims at the festival celebrating Lapu Lapu Day.

The youngest was Katie Le, a 5-year-old girl who was killed along with her parents, Richard Le, 47, and Linh Hoang, 30, according to local news reports. Mr. Le’s 16-year-old son, Andy, survived because of a last-minute decision to skip the festival in favor of homework, relatives said.

A school board in a nearby suburb said that a guidance counselor named Kira Salim was also among the dead. “The loss of our friend and colleague has left us all shocked and heartbroken,” it said in a statement.