21.   However, Russian forces on Sunday blocked British forces from the airport, where the headquarters had been expected to be located.

22.   In advance of his arrival, security forces blocked off three streets Monday in the capital, Kabul, to rehearse measures to protect Zaher Shah.

23.   In recent months, Serb forces have blocked U.N. convoys and held hundreds of peacekeepers hostage in retaliation for NATO airstrikes.

24.   In the past month, Serb forces have blocked U.N. convoys and held hundreds of peacekeepers hostage in retaliation for NATO airstrikes.

25.   It has triggered widespread violence regardless of whether security forces blocked the parade or forced it through.

26.   Kurdish activists in the southeastern town of Lice said security forces blocked a HADEP candidate for mayor from entering the town to vote.

27.   Neither report could be independently confirmed because Serb security forces have blocked off the area.

28.   Officials are mindful of the lessons of Srebrenica, where Serb forces blocked peacekeepers while rounding up thousands of civilians, many of whom were reportedly killed.

29.   Russian Defense Minister Igor Sergeyev insisted Tuesday that federal forces were successfully blocking rebels trying to flee Grozny.

30.   Security forces blocked major intersections Saturday in the Burmese capital, after breaking up overnight street demonstrations by students.