A suicide bomber blew up his car outside a small residential hotel frequented by foreigners just after dawn Tuesday, killing four guards, as two other militants stormed the hotel in Kunduz city and engaged the Afghan police in a two-hour gunbattle. The Taliban claimed responsibility for the assault -- the latest in a rising number of attacks in northern Afghanistan. The explosion rocked the neighborhood all around the house in Kunduz city, said Mubobullah Sayedi, a provincial spokesman. "When the bomber blew himself up, the explosion shook everything," Sayedi said. "It broke glass everywhere." Four Afghan building guards were killed and 10 other people, including an Afghan policeman, were wounded, Sayedi said. Foreigners staying at the two-story hotel escaped through the rear of the building, he said.