Mexico’s public health system has suspended infant vaccines and begun an investigation after two babies died and 29 became ill in an impoverished community in southern Mexico.

The Mexican institute for social security says six of the 29 babies are in grave condition after receiving vaccinations for tuberculosis, rotovirus and hepatitis B.

The cause of the adverse reactions is not known, the institute said Sunday.

It had stopped vaccines across the country on Saturday.

Father Marcelo Perez, a Catholic priest, said families of the babies said they became sick within hours.

The adverse reactions began on Friday and the babies were taken to a hospital in Simojovel, Chiapas, where 93% of the people live in poverty, according to government statistics.

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