Sebastian Vettel: 'Narain Karthikeyan is an idiot driver'

World champion Sebastian Vettel has compared HRT's Narain Karthikeyan to an idiot driver.

Red Bull's Vettel suffered a puncture while lapping Karthikeyan during yesterday's Malaysian Grand Prix.

As a result of the collision, Vettel was forced to settle for an 11th-place finish.

"Like on normal roads, you have some idiots driving around. It seems there is also one driving here," Vettel told reporters after the race.

Vettel is currently sixth in the standings.