Police in Athens have detained several people in connection with a thwarted plan to kill Belgian police officers, Reuters reports. According to a CBS News source, a man suspected of leading the group is among those being held.

Belgian authorities announced they had uncovered the plan to "to kill several policemen in the street and at police commissariats" this week after a series of anti-terror raids that ended with two suspects dead and 13 in custody.

However, several suspects remained free, including the man believed to be the terror cell's ringleader. From the BBC:

Earlier on Saturday, Belgian media said authorities were seeking Abdelhamid Abaaoud, a 27-year-old Brussels resident of Moroccan origin suspected of being the ringleader of the jihadi cell, and in hiding in Greece.

One of those arrested in the raids in Athens included one who "matches the description" of Abdelhamid Abaaoud, the Associated Press quoted a Greek police source as saying, but there has been no confirmation of the detainees' identities.

On Friday, prosecutors charged five of those arrested in Belgium with "participating in the activities of a terrorist group."

[Image via AP Images]