Pakistani Prime Minister Imran Khan arrived in Tehran to hold two days of bilateral talks. This is his first visit to Iran since he took office last year.
The news about the visit comes just a day after Islamabad urged Tehran to take action against separatist armed groups suspected of killing 14 people earlier this week in the Pakistani province of Baluchistan, which borders Iran.
According to Pakistan's Foreign Minister Shah Mahmood Qureshi, the "terrorist outfits" entered the country from Iranian territory.
The Islamic Republic has previously put forward similar demands, calling on Pakistan to act against terrorists following a February attack that killed 27 members of the Revolutionary Guards in Iran's Sistan-Baluchistan.