The northern German city-state of Bremen has closed down the Islamic Cultural Centre on Tuesday after a raid carried down in 12 apartments of members suspected on having links with Islamic militants.

The Islamic Association Bremen had links with similar cultural organisations.  It was banned after many of its members joined the Islamic State in Syria, said Bremen Interior Minister Ulrich Maeurer.

During the raid police impounded mobile phones, computers, hard drives and other memory cards. Around 220 officers cooperated in the raid, although no one was detained after the raid. Police also looked down for evidences in a car repair shop in Delmenhorst, just outside Bremen .

“This organisation has promoted the radicalisation of people, and support and following for IS. It really does mean that people who live in our immediate neighbourhood are willing to become terrorists overnight,” Maeurer said in a report by Indian Express.

“So I must sound cynical when I ask: What security do we have when they only plan attacks in Syria? We must assume that this could also happen in Germany.”

In 2014, Bremen authorities accused the Cultural and Family Society for provoking Jihad ideologies and promoting martyrdom among members. Six of them died during a fight with IS in Syria.

Last month, around 400 people were taken under close watch after the German police tightened its operation over the militants returning to Germany from Syria and Iraq.

German authorities have reported that there are many many cases linked with the Islamic State.

In December 2015, authorities shut down a mosque in Stuttgart for being involved in fund-raising efforts for militant organisations like ISIS in Syria according to a news filed by the news website RT.

Authorities raided The Islamic Educational and Cultural Centre Mesdschid Sahabe (MSM) in the southwestern city of Stuttgart. They seized mobile phone, computers, hardisks and other valuables connected to Islamic militant activities.

“The association supports, in the form of the so-called Islamic State, an Islamist group that carries out religiously-motivated attacks against persons and property,” said Reinhold Gall, the interior minister of Baden-Wurttemberg state.