A suspect is in custody after an Airdrie bus driver was threatened by a man with a knife in southern Alberta.

The incident happened on Friday afternoon and the bus driver says the man, who was holding a knife with a seven-inch serrated blade, told him to continue driving without stopping.

The driver stayed calm and told his dispatcher what was happening.

The call was then transferred to the RCMP.

An arrest was made without incident and no one was injured.