Mexico/Nicaragua Split

CANCUN, Mexico--Mexico is breaking diplomatic relations with Nicaragua because of the "horrendous genocide" committed by the government of President Anastasio Somoza, Mexican President Jose Lopez Portillo announced yesterday.

Hundreds of persons have been killed in Nicaragua in fighting that has continued since Somoza's national guard put down an uprising led by left-wing guerrillas last September.

Somoza's family has dominated Nicaraguan economic and political life for 42 years.