Two people were injured following an explosion that took place Saturday afternoon near the Fred Weber Quarry in Jefferson County, Missouri.
Five people were reportedly at the mine when the incident happened. One of the miners suffered minor injuries while another had to be taken to a nearby hospital. The cause of the blast is still unknown, according to local TV station KMOV.
Officials from the Mine Safety Health Administration are now at the rock quarry and have taken over the investigation. The site is owned and operated by asphalt and aggregate producer Fred Weber Inc.