KABUL, AFGHANISTAN - OCTOBER 28: An Afghan policeman stands guard by a Karzai poster after tensions in city remain high after a suicide bomb attack on an international guest house October 28, 2009 in Kabul, Afghanistan. Taliban militants killed six U.N. foreign staff in the early morning assault raising serious issues about security before the Presidential run-off election in less tham two weeks time. Rockets were also fired at a the Serena hotel but no injuries were reported.