David Bolaffi is checking all the doors at San Francisco's Congregation Sherith Israel, making sure they are locked and secured.
RELATED: Pittsburgh synagogue shooting: 11 dead, 6 others injured, including 4 police officers, FBI says
"The fear is copycats," Bolaffi said.
Bolaffi is security chief for the temple, where security has been stepped up, in the wake of the Pittsburgh synagogue massacre. Congregants are entering through a side door, escorted by guards.
"It is tragic, it is a hate crime. Hatred will not be tolerated. There is no place for hate, " Bolaffi added.
Security has been increased at Synagogues in #SanFrancisco after the #synagogueshooting in Pennsylvania. Rabbi Singer at Temple Emanu-El condemns the violence. #SFPD stepping up patrols. pic.twitter.com/YOoDQYBfjz— Cornell Barnard (@CornellBarnard) October 27, 2018
A San Francisco police officer was on patrol outside Temple Emanu-el in Presidio Heights.
Rabbi Beth Singer said a metal detector is nothing new outside her synagogue and neither is the fear of violence.
"It's something I'm personally worried about every day because of the rise of gun violence in churches, in schools and public places," said Rabbi Singer.
RELATED: Anti-Semitic flyers found at five East Bay synagogues ahead of Jewish High Holidays
We also found police officers on patrol around San Francisco's Jewish Community Center.
State Sen. Scott Wiener, D-San Francisco, blasted the president for suggesting the shooting rampage may have had a different outcome if the Pennsylvania synagogue had an armed guard.
"The solution is fewer guns and for the president to stop with his hate rhetoric inspiring people to commit acts of terrorism," said Wiener.
RELATED: What we know about Pittsburgh synagogue shooting suspect
So far, there's no evidence suggesting shooting suspect Robert Bower's acts were politically motivated.
For now, Rabbi Singer is making sure members of her temple feel safe.
"We pray for peace, we say Shabbat Shalom on this day, we pray for peace everywhere," Rabbi Singer said.
PHOTOS: Police response to Pittsburgh synagogue shooting
Find more stories, photos and videos about the Pittsburgh synagogue shooting here.