Pro-Russian separatists in Donetsk are now holding four monitors from the Organization of Security and Cooperation in Europe (OSCE), BBC's Russian Service reports. The Danish Foreign Minister has announced that among the four is a Danish citizen. Contact with the group was lost about 18:00 local time on Monday, says BBC.An Estonian Foreign Ministry official has also announced that an Estonian citizen is in the OSCE group and communication with him was also lost.