Obaidullah, who is " head of Daesh operations in the north and northeast of Afghanistan " and "one of the main masterminds behind the assassination of religious scholars Mawlawi Ayaz Niazi and Azizullah Mufleh," has been arrested during an operation, the NDS announced in a statement on Thursday.  
 
He was trained at the Haqqani Network's Abdullah Ibn Mubarak Madrasa between 2012 and  2014, and also received military training by the network in North Waziristan camps, the statement said. After his graduation, he acted as a trainer for the network.  
 
With the establishment of Daesh in Afghanistan, he joined the group with several other colleagues and became the head of Daesh operations in the north and northeast of Afghanistan, according to the statement.   
 
During the investigations, he "confessed that he was involved in several attacks in Kabul that were carried out by Daesh," the statement said.  
 
“Before Obaidullah was arrested, he was planning a bombing attack of the Imam Sadiq Mosque in Kunduz city,” according to the NDS.   
 
Mawlawi Niazi, a well-known religious scholar was killed in an explosion at Wazir Akbar Khan Mosque in downtown Kabul on June 2.  The explosives were placed in the yard of the mosque.  
 
Ten days after Malawi Niazi’s assassination, an explosion occurred at the Sher Shah Suri Mosque in the Kart-e-Char area in the west of Kabul city as people were partaking in the Friday prayer, killing at least four worshippers including mosque Imam Maulavi Azizullah Mufleh.  
 
Mofleh was also serving as a member of the Afghanistan Ulema Council.