The death toll in the tragedy soared, with President Enrique Pena Nieto saying another 68 people were feared dead in a landslide in the southern village of La Pintada in Guerrero state. An earlier count put the number of dead at 101.
"The sheer volume of earth that has virtually buried more than 40 homes there means (it would be difficult) to find anybody alive" in La Pintada, the president said during a press conference with members of his cabinet in Guerrero, the state hardest hit by the twin storms that have since dissipated.
A police rescue helicopter missing since Thursday also was found to have crashed, with no survivors, a government source said earlier.
Press reports said the aircraft, which had been set to deliver relief goods to and evacuate people from La Pintada, was carrying just its crew of three.
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Pena Nieto cancelled plans to travel to New York for the UN General Assembly next week and will instead stay in the disaster area to help coordinate relief efforts over the weekend.
Officials also began tallying the massive economic damage in a country where the growth forecast already was lowered drastically in August. Road repairs alone will cost about USD 3 billion, the transport ministry said.
The tropical storms have hammered the country since September 14, damaging tens of thousands of homes, flooding cities and washing out roads.
Mexico had not been hit simultaneously by two powerful storms like this since 1958, the National Weather Service said.
Thousands finally packed into cars and buses on Friday after authorities reopened road links to the capital.
Around 62,000 tourists have managed to leave the city, about half by road and half in special airlift planes.
The airport -- where the terminal flooded last Saturday -- should be practically back to normal on Sunday, Communications and Transport Minister Gerardo Ruiz Esparza said.
Interior Minister Miguel Angel Osorio Chong told radio station Formula that the damage from the storms was "beyond calculation.