Police in the California community where a man killed six college students said on Monday they had no grounds to search the 22-year-old suspect's home when they met with him in April over a report that he had posted disturbing videos online.

The disclosure that the Santa Barbara County Sheriff's Department sent deputies to Elliot Rodger's door just weeks before Friday night's shooting rampage has raised questions about whether police could have done more to prevent the attack.

Rodger's mother asked deputies on April 30 to check on him at his apartment in the town of Isla Vista, near the University of California at Santa Barbara, after she saw videos he had posted on the Internet that she found disturbing.