KUWAIT CITY: Markets in Gulf Arab states tumbled on Monday impacted by growing tension between Saudi Arabia and Iran and global stocks rout over Chinese economic slowdown. Six of the seven bourses dropped led by Saudi Arabia and Qatar, the biggest two Arab stock markets, while Omani shares rose slightly. The Saudi Tadaul All-Shares Index dipped 2.36 per cent to finish on 6,788.13 points with all the 15 sectors dropping. Qatar Exchange shed 2.64 per cent to 10,041.70 points while Dubai Financial Market Index was down 1.6 per cent.