Mexico City ? Soldiers dug in the debris from a landslide that buried a highway in east-central Mexico and killed at least four people, but ended the search Friday without finding more victims.

Thursday’s mudslide followed one a day earlier that killed 10 people in northern Mexico.

The side of a mountain collapsed on a highway in the central state of Puebla, slamming into a tractor trailer, a pickup and several buses.

Officials had said one of the dead included a woman whose backpack contained several baby bottles, prompting rescue workers to search for an infant among the debris.

At least 11 people were injured, Puebla’s interior secretary, Javier Lopez Avala, said at a news conference late Thursday.

Lopez Avala said workers had been using heavy machinery at the site recently to extract gravel, which weakened the hillside that collapsed. Heavy rains have pounded that part of the country in recent weeks as well.