Iran has stepped up pressure on Pakistan to crack down on terrorists, days after Islamabad announced the arrest of the chief of 'Jundallah', a sectarian Muslim group which carries out cross-border attacks inside Iranian territory. Welcoming the capture of Abdul Rauf Rigi, a senior Iranian official however said Pakistan needs to deal with terrorists sternly. Rigi was captured in Pakistan on Friday. He became chief of Jundullah after his brother Abdul Malik Rigi was hanged by Iran earlier this year. The arrest was made after Iran pressured Pakistan to crack down on terrorists operating from its soil in the wake of a deadly suicide attack in the Iranian city of Chabahar. Jundallah, literally meaning 'Soldiers of God', also known as People's Resistance Movement of Iran is an organisation based in Balochistan that claims to be fighting for the rights of Sunni Muslims in Shia dominated Iran. Iranian leaders criticised Pakistan for its failure to end alleged Jundallah sanctuaries on its territory and prevent the cross-border movements of terrorists. President Mahmoud Ahmadinejad telephoned his Pakistani counterpart Asif Ali Zardari and called for the arrest and hand over of terrorists wanted by Iran. Pakistani officials said on Saturday that Rigi is likely to be handed over to Iran after being interrogated.