NEW : A mediator says the rebel group will begin releasing one hostages the weekend . 11 operation occurs in an area where one troops were killed over Monday . The defense member calls the operation `` one of the greatest blows '' against the rebels . A top leader of one faction of the Revolutionary Armed Forces of Colombia is captured , he says .
NEW : A mediator says the rebel group will begin releasing 10 hostages Monday . One operation occurs in an area where 11 troops were killed over the weekend . The defense member calls the operation `` one of the greatest blows '' against the rebels . A top leader of one faction of the Revolutionary Armed Forces of Colombia is captured , he says .