GREENSBORO, N.C. — A security concern stalled the start of March Madness Thursday in San Diego, when police evacuated the building after a bomb-sniffing dog found a suspicious looking package in a vendor's cart.

This comes just days after an FBI security alert had arenas around the country double-checking security plans at tournament sites -- including Greensboro Coliseum.

There seemed to be no increased tension at the Coliseum on Thursday afternoon, as fans streamed into the facility to watch first-round action in the NCAA Tournament. However, from the parking lot to the concession stands, authorities held nothing back in ensuring the safety of those inside.

"They've been fairly polite, very quick," said fan Carl Fincke. "They didn't do anything out of the ordinary."

The rules are the same as they were the week before, at the ACC Tournament. No backpacks or coolers are allowed inside the Coliseum, and bags are searched before entering. All fans and employees also go through metal detectors.

"It's better than when you just walk through the door and just give them your ticket," said Duke fan Richard Starr.

"I certainly hope that (fans) don't feel like (the security) is a hindrance," said security consultant Frank Hinds. "I would hope that they would feel safe."

That would seem to be the case on Day One of the tournament.

"Every exit and all the aisles are covered," said Duke fan Mike Johnston. "It makes you feel safe."

The NCAA has not yet commented about the incident in San Diego or what impact that might have on the tournament games in Greensboro.