O/R The Abu Dhabi index .FTFADGI climbed 1.2%, led by a 1.5% hike in its top lender First Abu Dhabi Bank FAB.AD and a 14.7% surge in Dhabi National Energy Company TAQA.AD. Sept 15 (Reuters) - Gulf equities edged higher on Thursday, brushing aside fragile risk appetite in stock markets globally after investors assessed the prospect of an aggressive U.S. interest rate hike to tackle rapid inflation. Oil prices drifted lower as weak demand concerns over a large build in the U.S. crude inventory plus a strong dollar overtook potential supply disruption as the centre of focus.