Former President Barack Obama was in San Jose on Sunday night for a meeting with tech leaders, sources told NBC Bay Area.

The details of the meeting at the Fairmont hotel in downtown San Jose were not known. It's Obama's first visit to the Bay Area since he left office in January.

Several Secret Service agents could be seen around the hotel, and some guests said they saw the former president's motorcade and bomb-sniffing dogs. Other guests said the interior hallways of the hotel were swarming with security.

Obama flew from Washington, D.C., early Sunday and made a stopover in Omaha, Nebraska, for a quick lunch with billionaire business magnate Warren Buffett at a private country club, according to the Omaha World-Herald. Obama ate a taco salad at the Happy Hollow Country Club, and Buffett picked up the tab, the newspaper said.

Details of that meeting also were not provided.

While he was in office, Obama made numerous visits to the Bay Area, mostly for private fundraising events or meetings with business leaders.

It was not known how long the former president's latest visit would last, and no public appearances were listed on his schedule.