Two explosions and shooting have been heard at a US military base in the Afghan city of Jalalabad, according to a Reuters witness.
The Taliban said they carried out an attack on the compound and inflicted casualties. NATO officials were not immediately available for comment.
More top news
Special forces say they have attacked a sprawling site adjacent to the city's airport in a bid to liberate the area from IS.
Commuters were also warned to expect travel chaos as Doris gathered speeds of nearly 90mph.
A man with 62 penalty points on his licence is among thousands of motorists allowed to drive despite exceeding the limit warranting a ban.