Sunday was a bad day for Adrian Sutil and Paul di Resta, drivers for Force India in the Korean F1 GP. Shame guys, things happen.YEONGAM, South Korea - Force India drivers Adrian Sutil and Paul di Resta apolgised to rivals and colleagues on Sunday after a disappointing 2013 Korean F1 GP.Sutil went to apologise to Red Bull's Australian Mark Webber for skidding into his car, which then caught fire after the side impact burst an oil radiator.It was the second successive race in which Webber retired with his car in flames.FIRST RETIREMENT"I hit Webber so I apologise for ending his race. It's a disappointing end to the race because I believe there was still a chance of a point," said Sutil, who was classified 20th despite not finishing.Di Resta was the first retirement of the race, going out on lap 24 - the Scot's sixth GP prix in a row without scoring a point."I have to hold my hands up and apologise to the team. Maybe I took a little bit too much kerb and that sent me off the track," he explained. "The way we've set up the car means it has been quite edgy and difficult to drive, and that's what has caught me out today."Force India remained sixth overall in the championship but slipped further behind McLaren, which scored five points and is now on 81 - 19 clear of the Indian-owned team.