Iran has shut its border with Pakistan as latter’s authorities took three Iranians in to custody over alleged cross-border attack, killing one Pakistani citizen, BBC Urdu said in a report. Earlier, the incident took place when the Iranians reached Mazan Sar Mashkail, in Washuk district, three kilometres (1.8miles) inside Pakistan where they opened fire on a vehicle they were chasing, according to officials in Balochistan province. All three personnel of Iranian border security force were taken into custody for their penetration inside Pakistan and killing a Pakistani national on our soil”, Saeed Ahmad Jamali, Deputy Commissioner of Washuk district told a foreign news agency.