By Asif Shahzad

ISLAMABAD, Jan 15 (Reuters) - Pakistani students returning from Iran on Thursday said they heard gunshots and stories of rioting and violence while being confined to campus and not allowed out of their dormitories in the evening.

Iran's leadership is trying to quell the worst domestic unrest since its 1979 revolution, with a rights group putting the death toll over 2,600.

As the protests swell, Tehran is seeking to deter U.S. President Donald Trump's repeated threats to intervene on behalf of anti-government protesters.

"During nighttime, we would sit inside and we would hear gunshots," Shahanshah Abbas, a........

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