The tweet closely mirrored the one Trump wrote hours after the shooting on November 5, which read, "May God be w/the people of Sutherland Springs, Texas". The gunman behind the rampage shot 14 people, killing four, in seven different locations, including an elementary school, before he died in a shootout with police. "The FBI and Law Enforcement has arrived", Mr Trump tweeted shortly after 8.30pm on Tuesday evening.
The time that the shooting at Sutherland Springs, Texas took place, president Trump was with his wife Melania Trump at the five-nation, 12-day tour of Asia.
The shootings in California occurred in the rural community of Rancho Tehama Reserve, a homeowners association in a sparsely populated area about 130 miles north of Sacramento.
"Are you out of your mind?" one Twitter user furiously asked. Another added: "Did you reuse this tweet for the last mass shooting? I can understand why it would be easy to mix mass shootings up, as they happen every other week".
Four hours after the tweet was sent, despite criticism, it remained live on the social network.
"The President of the United States is tweeting at midnight about the wrong mass shooting and it's like the 500th most insane Trump story of the week", a user said.