The Iranian Foreign Ministry on Tuesday summoned the Turkish ambassador to Tehran to protest at Ankara\'s inaction in the face of a terrorist attack on an Iranian bus in Turkey earlier this month.At the meeting with Turkish Ambassador to Iran Omiat Yardimi, Iranian Foreign Ministry\'s director general for Iranian Expatriates voiced protest at Ankara for its unacceptable response to the Iranian bus attack incident. The Iranian Foreign Ministry official reminded that Turkey has certain responsibilities, and urged Turkish authorities to detain those who attacked the Iranian bus. An Iranian bus was attacked by unknown assailants in the city of Archesh in the Turkish province of Van. The attack caused severe injuries among the 40 passengers of the bus.