A 34-year-old Moroccan citizen was arrested by the Spanish National Police in Madrid on suspicion of belonging to the so-called Islamic State (ISIS), the Spanish Interior Ministry announced Monday.

The Spanish Ministry said in a statement that the police arrested the Moroccan citizen because of “the potential danger he posed, as well as the security measures he adopted, such as changing his home and his telephone number periodically.”

The police also discovered that he had written posts on the Internet calling for war and violent jihad both in Syria and Spain, with statements like “We are born in the war and we are warriors” and “The blood is spilled there and here too.”

The investigation found that the arrested individual was living in several apartments in Madrid in order to avoid being located. Similarly, the suspected terrorist allegedly only accessed social networks using cybercafés.

Spanish authorities have arrested a total of 251 terrorists who had pledged allegiance to ISIS since the beginning of 2015, when the country raised its terror alert to level four in the aftermath of a number of deadly terrorist attacks in Europe, according to the ministry.