KABUL — Flash floods have swept northern Afghanistan, killing at least 37 people, Afghan and UN authorities said Saturday.

More than 100 homes, hundreds of acres of farmland, and farm animals were destroyed by the floods that followed four or five days of heavy rain in the region.

Abdul Hai Khateby, the spokesman in Ghor Province, said 24 people have been killed in four districts, including the provincial capital of Chaghcharan.

“Many, many houses have been destroyed, and there are reports of lots of cattle and other animals being killed,” Khateby said. “It is cloudy, and we expect more rain.”

The provincial spokesman of Badakhshan, Abdul Marouf Rasekh, said that 13 people were killed Friday night in the Yaftal district and that four other districts have been affected.

The Afghanistan National Disaster Management Authority said an estimated 135 houses had been destroyed in Badakhshan, forcing residents to flee.

The UN Office for the Coordination of Humanitarian Affairs said many of the unpaved, rutted roads in the area have been severely flooded, making aid distribution difficult.

Elsewhere, a bomb exploded at a music store Saturday in Jalalabad, the provincial capital of Nangarhar in the east.

Provincial spokesman Ahmad Zia Abdulzai said that the shopkeeper and one of his customers were killed in the blast and that two other people were wounded.

The US-led coalition said two NATO service members were killed Friday by insurgents in southern Afghanistan. So far this year, 203 NATO service members have been killed in Afghanistan.

Last week was particularly violent in Afghanistan, as insurgents stepped up attacks against international forces. The fighting suggests the Taliban are not planning to wait for international combat forces to complete their exit from Afghanistan at the end of 2014. The United States plans to withdraw 33,000 American troops by the end of September, leaving about 68,000 US military personnel in the country.