Iranian authorities arrested another pastor last week, according to Present Truth Ministries.
Pastor Amin Khaki and two members of his fellowship were taken into custody Thursday by Iranian intelligence.
Present Truth Ministries reports that intelligent officers attacked a group of Christians during a church picnic, pulling their guns and beating them before taking all of them into custody.
They were blindfolded and held for six hours in interrogation rooms. All but the pastor and two others were released.
Pastor Khaki, Rahman "Ziya" Bahmani, and Hossein "Daniel" Baroun are still in custody pending charges.
According to the report, they could be held for a month without being charged while authorities investigate.
In January, Iranian secret police raided Pastor Khaki's home and confiscated his laptop and other Christian materials.