Southwest Airlines Co. said technical disruptions grounded some planes, blocked use of its website and prevented travelers from checking in for flights Wednesday.

Intermittent issues with “multiple technology systems” started in the afternoon, the carrier said in an e-mailed statement. The problems forced Southwest to ground flights that hadn’t left their airport gates, and to manually process some customers.

“We have a team of experts working diligently to resolve the technical issues, and their efforts have systems gradually coming back online,” the airline said. “We expect to continue our move toward a normal operation, but believe it will take time.”

The airline, which said a “significant” number of flights were affected without providing a number, told customers on Twitter that it didn’t know when the problems would be corrected.

The incident is similar to an October disruption that forced the airline to manually process travelers, who were asked to show up for flights at least two hours early. At least 450 flights were delayed then. The carrier never provided details of what caused the failure.

Southwest replaced its normal website home page, where customers usually search for flights and make reservations, with one advising visitors not to refresh their browser and that they would be transferred to Southwest.com “as soon as possible.”

To contact the reporter on this story: Mary Schlangenstein in Dallas at maryc.s@bloomberg.net. To contact the editors responsible for this story: Brendan Case at bcase4@bloomberg.net, Bruce Rule

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Photo Credit: In this Sept. 8, 2014 photo, a Southwest Airlines plane sits outside a hangar at Love Field in Dallas. Some Southwest planes were grounded Wednesday because of a computer outage. LM Otero / Associated Press