NORWALK - Metro-North officials say a computer malfunction was behind an incident Tuesday where a message warning people to evacuate was played at many stations.

A spokesman for Metro-North says a message advertising train service to Yankee Stadium was supposed to play.

He says when a new message is added, it overwrites an old message. In this case, a computer crash caused the old message that should have been out of the system to play.

Metro-North says it will now permanently delete old messages out of the system so a similar incident won't happen in the future.