"May God be with the people of Sutherland Springs, Texas", Trump tweeted Tuesday evening, according to Newsweek. "The FBI and Law Enforcement has arrived", Trump tweeted from his personal Twitter on Tuesday night.
The shooting occurred more than a week ago.
Twitterati wondered whether Trump resent an old message or meant to address the shooting in Northern California that left four dead - but forgot to change the name of the community.
Trump's misguided tweet was timestamped at 11:34 p.m. and remained live as of early Wednesday morning.
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It was almost word-for-word the same as the tweet posted a short time after the Sutherland Springs shooting - in which 26 members of a church congregation were killed.
On Nov. 5, Trump tweeted almost the same thing about the shooting in Texas, where a gunman killed 26 people at a church.
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.
Another Twitter user wrote: 'He's mixed up mass shootings, confusing the one last week in Texas with the one in California today.
After Trump's apparent blunder, Piers Morgan tweeted: 'At least get your mass shootings right, Mr President.