The leftist Sandinista government has refused to allow an opposition labor federation to march on Sunday, the first anniversary of the Central American peace plan.

The Interior Ministry said police decided on the ban Wednesday "after analyzing the last incident and its consequences."The Permanent Congress of Workers wanted to hold a march on Sunday to mark the anniversary of the signing on Aug. 7, 1987, by five Central American presidents of a regional peace plan known as Esquipulas II.

Rolando Velazquez, an official of the Independent General Confederation of Independent Workers said the ban "totally violates the accords of Esquipulas II that we are trying to celebrate."