New Delhi/Teheran, Jan. 14 -- Iran's defence minister warned on Wednesday that the country had "many surprises" in store for any adversary that attacked it, as tensions with the United States escalated sharply and weeks of deadly protests continued to rock Teheran.

The Iranian bravado followed an intensification of rhetoric from President Donald Trump, who has suggested the United States could intervene militarily as Iran's leadership struggles to contain unrest that began late last year over worsening economic conditions.

Many countries including India issued travel advisories asking citizens to return from Iran and those planning to travel to the Islamic republic to stay away.

"If these threats are turned into action, we will defend th...