Several people were injured Tuesday when a gunman opened fire at a subway station in New York City, officials said.
The gunman filled a rush-hour subway train with smoke before he shot multiple people. Commuters were seen bleeding on the subway platform as others ran for safety. The shooter is still at large.
From BART to Muni to VTA, transit agencies across the Bay Area said they have increased uniformed patrols in an effort to make passengers feel safer.
BART police Chief Ed Alvarez said they "will continue to conduct high visibility patrols through trains and stations and will use our network of more than 4,000 cameras to monitor the system."
The agency encouraged riders to report any suspicious activity by calling BART Police Dispatch at 510-464-7000 or using the free BART Watch app.
San Francisco police also increased patrols at transit centers.
SFPD said there is no known threat to San Francisco, but said they are staffed to handle all calls for service and urged officers and commuters alike to stay vigilant.
"Prayers for those affected by the horrific subway shooting," the San Francisco Police Department said on Twitter. "We applaud all of the first responders who are on the scene working to secure the area and provide aid."
San Francisco Muni told NBC Bay Area in a statement they are "devastated to hear the news and our hearts go out to our transit colleagues in NY and everyone impacted."
Muni officials also said there is no credible threat for local transit.
"We are working with SFPD and monitoring the situation locally," Muni said.
In the South Bay, VTA was increasing patrols on the light rail system, aboard trains and at light rail stations.
"Although there have been no specific threats to the VTA system, the Sheriff’s Office Transit Patrol is ensuring that the riding public is not only safe on board but also feels safe and confident to ride public transit," a statement read.
Part of the patrols featured Santa Clara County sheriff's deputies walking the platforms with bomb sniffing dogs.
“We have three K-9s that are dedicated to VTA and they're all bomb trained, and we have two patrol dogs as well," Santa Clara County Sheriff's Office Sgt. Tyrone Monroe said.