JERUSALEM - A top US security official was due to meet Israeli Prime Minister Benjamin Netanyahu on Sunday amid rising concerns over Iran and ahead of a trip by the Israeli premier to Washington.

The White House has said that National Security Advisor Tom Donilon would talk to senior Israeli officials on a range of issues, including Syria. An Israeli official said he would meet Netanyahu on Sunday afternoon. The visit comes at a time of hightened tension between Israel and Iran over Tehran's nuclear programme, and in the wake of attacks on Israeli diplomats blamed on agents of Tehran. In recent weeks, there has been feverish speculation that Israel was getting closer to mounting a pre-emptive strike on Iran's nuclear programme, though Israel has denied reaching such a decision.