WARSAW, Poland—A powerful underground tremor and methane gas discharge hit a second coal mine Saturday in southern Poland, forcing dozens of workers to flee the mine and leaving authorities unable to contact 10 other miners still missing, officials said.
The accident at 3:40 a.m. Saturday at the Borynia-Zofiowka mine occurred 900 meters (2,950 feet) underground. It was the second colliery accident in just four days in the coal mining region around the town of Jastrzebie-Zdroj, near the Czech border.
Repeated methane blasts since Wednesday at the nearby Pniowek mine have killed five miners, left seven miners and rescue workers missing, and injured dozens of others. The search for those missing at Pniowek was suspended Friday after new blasts late Thursday injured seven rescue workers, some seriously.
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