Another centrally orchestrated series of raids was carried out on the homes of some of the faculty members and administrators during 22–24 May 2011. Officials from the Ministry of Intelligence entered the homes of at least 30 of the academic staff of the BIHE, seizing books, computers and personal effects. The buildings used as laboratories and for academic purposes in Tehran have also been closed. The searches or arrests took place in Tehran, Zahedan, Sari, Isfahan and Shiraz. A total of 16 educators were arrested. A second wave of arrests on September 2014 targeted few other professors. Some of those arrested were released within a couple of weeks. The rest were put on trial, accused of "conspiracy against national security" and "conspiracy against the Islamic Republic of Iran", and sentenced to four to five years of imprisonment. Today, a number of them have been released after finishing the terms of their sentences, while others remain in jail.