By Asif Shahzad, Ariba Shahid and Fayaz Bukhari ISLAMABAD/SRINAGAR, India (Reuters) -Pakistan closed its air space for Indian airlines and rejected New Delhi's suspension of a critical water sharing treaty on Thursday in retaliation for India's response to a deadly Islamist militant attack on tourists in Indian Kashmir.

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.

Pakistan cancels visas for Indian nationals, suspends trade, closes airspace following deadly Kashmir attack.