At least 26 people were killed and 17 others wounded when gunmen opened fire on tourists in Indian-controlled Kashmir, the worst assault in years targeting civilians in a restive region that has seen an anti-India rebellion for more than three decades.

At least 26 people were killed and many others injured Tuesday, the vast majority of them tourists, when suspected militants opened fire on civilians in Indian-controlled Kashmir, according to Indian authorities in the region.

The nuclear-armed rivals, which both claim Kashmir and administer separate parts of it, are at a dangerous crossroad after Tuesday’s militant attack, analysts said.