Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Afghan University Teacher, Students Among IS Operatives Arrested in Kabul Ayaz Gul ISLAMABAD - Afghan authorities say they have arrested four Islamic State (IS) operatives, including a university teacher, during a counterterrorism raid in Kabul. The arrests come amid recent reports the Middle Eastern terrorist group has grown into a major security challenge for U.S.-backed Afghan forces struggling to contain the Taliban insurgency. Afghanistan's spy agency, National Directorate of Security (NDS), while announcing the arrests, said in a statement the suspects were involved in recruiting fighters for IS and organizing terrorist attacks in and around the capital city. It identified one of the detainees as a Kabul University lecturer, Mubashir Muslimyar, while the rest as graduates of the same institution. The men are said to have told investigators they were working closely with IS operatives in eastern Nangarhar province and many educated young Afghans were joining their ranks. This is not the first time that the NDS has arrested suspected IS operatives from Kabul University. Weeks back, another lecturer was also taken into custody on the same charges. IS has not commented on the arrests. The Afghan branch of IS operates under the name of Khorasan Province (ISKP). It is estimated to have about 2,000 fighters in the country. Locally known as Daesh, the terrorist outfit has carried out major attacks in Kabul and Nangarhar, where it is believed to have set up strong bases in several districts. The militants are also active in parts of the adjoining eastern Kunar province. Former Afghan national security advisrr, Haneef Atmar, told VOA militants linked to IS also are present in northeastern Badakhshan and northern provinces of Jowzjan and Faryab. .