Two teenagers were crushed by a wall and a man was swept away by a river in the latest deaths at the weekend in the southern state of Oaxaca, according to regional civil protection authorities.

A total of 15 deaths have been reported in Oaxaca, and at least 10 in the eastern state of Veracruz since last week.

The governor of neighboring Tabasco state, where no deaths have been reported, has warned worse was to come in October and November.

Marines started dredging rivers in the area on Sunday.

Authorities in Tlacotalpan, a colorful colonial-era town near the port of Veracruz on Monday called on the United Nations to help evaluate damage to 540 flooded buildings which earned it classification as a UNESCO heritage site.

President Felipe Calderon last week said Mexico was experiencing its worst rainy season on record, and the rains were set to intensify.

After Hurricane Alex thrashed northeastern Mexico in July, causing 22 deaths and leaving some 40,000 homeless, Hurricane Frank left four dead and two missing as it traveled up Mexico's Pacific coast in August.

A tropical depression which may turn into a hurricane was meanwhile bringing more rains toward Mexico's southeast Yucatan peninsula and the Caribbean islands of Hispaniola, Jamaica, Cuba and the Cayman Islands, according to the US National Hurricane Center's latest bulletin.

"These rains could cause life-threatening flash floods and mud slides, especially in mountainous terrain," it warned.

Thousands of people remained cut off from communications and food supplies in neighboring Guatemala Monday, where record rainfall has left at least 46 dead and 15 missing this month alone, according to official figures.

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