Further attacks need the blessing of the United Nations commanders in Bosnia.

He said that the United Nations commanders planned to monitor the weapons using helicopters.

Under agreed procedures, the United Nations military commanders in the former Yugoslavia have the right to ask for air attacks.

But local commanders have ignored the appeals, telling the United Nations commander through aides that they are not available for discussions.

He said he would travel to Sarajevo to demand action from United Nations commanders.

The major also said that Serbian artillery men had been careful not to target what United Nations commanders here consider the safe area.

And later Nigeria said it did not want its troops to serve under United Nations commanders.

In drawing up the proposals, the United Nations commanders were following a policy that has guided them from the outset of their deployments here.

For the moment, though, United Nations commanders are treating the withdrawal as an important break.

The strain this question placed on United Nations commanders in Bosnia was evident.