The Kenya Bus Services Limited has issued a warning on a new ploy used to con passengers.

The bus company urged Kenyans to take extra caution before taking their seats in the bus after a passenger raised concern over the worrying trick.

Through their social media page, the passenger highlighted how criminals are strategically placing syringes containing an unknown drug that, when pricked with it, renders passengers unconscious in a matter of seconds.

The criminals then pretend to be the victim's relative and help them off he bus.