1.   It caused an impasse, and Margetson relinquished his position at Bird-Air.

2.   No sooner had Clinton acknowledged the stalemate at Camp David than Israeli and Palestinian officials took to blaming the other side for causing an impasse.

3.   But Gore would discuss issues causing the impasse, including disputes over an Israeli troop pullback in the West Bank, the official said.

4.   But they are causing an impasse.

5.   So far, the key separatist rebel group, FALINTIL, has refused to send a delegate, causing an impasse.