Afghanistan’s chief of national security, Sayed Ansari, said Saturday that six Afghans have been arrested for planning this week’s guest house suicide attack that killed five UN employees in Kabul.

The three suicide bombers were Pakistanis, he added.

Mulla Qari Aminullah, a religious teacher from a local mosque, was among the six in custody. He was arrested Thursday in Medina, Saudi Arabia.

Aminullah, from Ghazni province, is accused of hiding the three attackers in his Kabul home, Ansari said.

He added that national security staff arrested Aminullah at Medina’s airport as he was heading to the annual Hajj pilgrimage.

Two of the UN personnel who died in Wednesday’s attack by Taliban gunmen were helping the Afghan government plan for the November 7 runoff election, UN Secretary-General Ban Ki-moon said Friday.

Two of the other victims were security staff; the fifth had not been identified.

(article and photo source: CNN)