KABUL, Afghanistan — Nine suicide bombers penetrated several rings of security to lay siege to one of the capital’s premier hotels for six hours overnight Tuesday in a complex attack that jolted Afghans’ sense of security and highlighted the weakness of their police forces. At least 21 people were killed: all the attackers, two policemen, nine Afghan civilians, and one foreigner, a Spaniard.

 

One witness said that the police failed to stop a man who obviously presented a threat: a man carrying weapons, dressed in a police uniform but with a white hat of the kind often favored by religious Afghans and instead urged the witness to move away from the man, calling him a “bomber.” Other witness accounts said that some security officers fled. The siege ended in the morning; at least five of the attackers blew themselves up, and others were shot by Afghan and NATO forces.