Seven people were killed and four others injured when a mudslide buried part of the highway linking this capital with the central city of Queretaro, 213 kilometers (132 miles) to the northwest, Mexico's transportation secretary said Monday.

Heavy rain and hail Sunday night sent a wave of mud and rocks down the side of a mountain near Tepeji del Rio in Hidalgo state, Gerardo Ruiz Esparza said on Twitter.

Efforts to clear the highway are in progress, the secretary said.

Authorities closed the Mexico City-bound lanes of the expressway, a source in the Hidalgo state government told Efe.

Seven vehicles were buried in the mudslide, the source said, adding that several homes in the area were flooded.

Hidalgo was the scene earlier Sunday of a bus accident that left 16 people dead, state prosecutors said.

They said a tour bus headed to the capital crashed on the Mexico City-Tampico highway near Corredor de la Montaña. EFE