NEW : Human Rights Watch blames both sides for ` ` serious . '' The UN peacekeeping chief accuses Gbagbo 's government of a ` ` ' '' He says they used a lull in fighting to strengthen their positions . The report pinned most of the blame , however , on supporters of the internationally recognized president . The UN may use force if Gbagbo rival Ouattara 's hotel is attacked .
NEW : Human Rights Watch blames both sides for ` ` serious . '' The UN peacekeeping chief accuses Gbagbo 's government of a ` ` ' '' He says they used a lull in fighting to strengthen their positions . The UN may use force if Gbagbo rival Ouattara 's hotel is attacked .