A State Department spokesman in Washington said US authorities were 'deeply concerned' about the incident in which Jewish settlers threw stones at the cars of a US diplomatic delegation which came to inspect vandalism to nearby Palestinian-owned trees in the West Bank on Friday. 'We can confirm a vehicle from the Consulate General was pelted with stones and confronted by a group of armed settlers today in the West Bank, near the Palestinian village of Turmus Ayya,' said the US State Department spokesman according to AFP.