Seven people were arrested early on Tuesday in the Roma neighborhoods of Plovdiv and Pazardzhik for preaching radical Islam on Facebook.

The arrests were made in the Roma districts of Plovdiv, Asenovgrad, and Pazardzhik under the supervision of the prosecuting authority, according to reports of the Focus news agency.

According to reports of 24 Hours daily, the operation was conducted by the State Agency for National Security (DANS).

The special operation is said to be related to the operation launched in November 2014 by DANS against alleged radical Islamists.

The Supreme Prosecutor’s Office of Cassation is to disclose details about the operation later on Tuesday.