BERLIN - Law enforcement authority in Germany reported on Thursday that four suspects allegedly involved in "Islamic State (IS)" have been apprehended in different German states.

According to a statement posted on the official website of the Federal Prosecutor General of the Federal Court of Justice, the accused are "strongly suspected of having participated" in Iraq as members of "Islamic State".

The four Iraqi nationals were arrested in Dortmund, Bottrop, and the Bavarian district of Amberg-Sulzbach respectively on Wednesday. Their homes were searched.

Among the accused, the 27-year-old Mohammed Rafae Yaseen Y. is suspected of aiding and abetting murder and war crime. He is accused of being responsible for 12 attacks in Iraq from 2006 to 2008 as an IS member, killing both soldiers and civilians.

The 26-year-old Hasan Sabbar Khazaal K. allegedly produced and disseminated propaganda material for the IS. In particular, he filmed executions, punitive actions and missions of the IS and prepared the videos, according to the prosecutor.

The other two were suspected of completing a four-month military training, and one of them allegedly took part in combat operations.

The four suspects left Iraq in mid-2015 and entered Germany shortly thereafter.