One person was killed and four others were in critical condition after a shooting at a church near Los Angeles, law enforcement confirmed on Sunday, just one day after a gunman killed 10 people at a grocery store in New York state.

Parishioners were attending a banquet following a morning church service when the gunman began his rampage, authorities said. 

The churchgoers subsequently detained the shooter and "hogtied his legs with an extension cord and confiscated at least two weapons" before officers arrived at the scene to arrest him, Orange County Undersheriff Jeff Hallock told a press conference.

Investigators were still searching for a motive, Hallock said, adding that the gunman, who was not injured during the incident, was believed to be an Asian adult male in his 60s.

The victims were mostly Asian and mostly of Taiwanese descent, the Los Angeles Times reported, citing authorities. 

Officials said they were still sorting through the timeline and details with the approximately 30 to 40 witnesses who were inside the building. 

The office of California Governor Gavin Newsom said it was working with local officials to monitor the situation.

"No one should have to fear going to their place of worship. Our thoughts are with the victims," the office tweeted. 

Democratic Congresswoman Katie Porter, who represents Orange County in Washington, called the shooting "upsetting and disturbing news, especially less than a day after a mass shooting in Buffalo."

"This should not be our new normal," she added.

The latest shooting comes one day after an 18-year-old white suspect shot dead 10 people and wounded three others -- almost all of them Black -- at a grocery store in Buffalo, New York in what officials are calling a racist rampage.

Mass shootings have become shockingly common in the United States, where past efforts at tightening the nation's gun laws have generally fallen short in the face of the nation's powerful gun lobby -- even after horrific gun massacres.