Sebastian Vettel produced a last gasp lap to claim pole position for the Turkish Grand Prix.

The 21-year-old German denied Jenson Button a hat-trick of pole position starts with a late charge around the Istanbul Park circuit.
Button's team-mate Rubens Barrichello completed the top three qualifiers after he produced pulled out a lap at the end of a Q3 session that he started in sluggish fashion.
It was another frustrating day for world champion Lewis Hamilton, who failed to progress from the first qualifying session for the second consecutive race.
The McLaren driver struggled with a lack of grip and was edged out by an impressive performance from his former Formula Three team-mate Adrian Sutil.
Brazilian Nelson Piquet, the two Toro Rosso drivers and Giancarlo Fisichella of Force India joined Hamilton in the bottom five.
In the second qualifying session, Vettel was quickest as Nick Heidfeld, Kazuki Nakajima, Timo Glock, Hamilton's team-mate Kovalainen and Sutil finished outside the top 10 and so did not make it into the Q3 shootout.