By Alex MacDonald

LONDON--Mining titan Rio Tinto PLC (RIO) said Friday that it has asked the families of its foreign employees to leave Mozambique amid mounting violence, the worst since the country ended its civil war about two decades ago.

"Rio Tinto Coal Mozambique can confirm that it is making arrangements for the dependent family members of its foreign employees to return to their home countries temporarily," the Anglo-Australia miner said in a statement.

"The safety of the employees and their families is the number one priority and the business will continue to monitor the situation and respond appropriately," it added.

Rio Tinto owns and operates coal concessions in the northwest province of Tete and has been exporting coal from the region since 2012. Rio Tinto said the operations "continue as planned, including the shipment of coal."

A company spokeswoman didn't provide further details as to why it was evacuating the families of its foreign employees but international firms have grown nervous about the escalating violence in the country.

Mozambique has experienced months of sporadic, low-level clashes between the Renamo opposition party and government forces. In June, Rio Tinto suspended coal shipments from the region after Renamo threatened to disrupt the Sena railway line, which is used by Rio and Brazilian miner Vale SA (VALE) to transport coal to the port of Beira for export.

The violence escalated last week when Mozambique troops attacked Renamo's main bush camp where Renamo's leader Afonso Dhlakama was based, forcing him to flee into hiding. Renamo accused the government of trying to kill Mr. Dhlakama and said the action signalled the end of the Rome Peace Accords, the 1992 agreement that ended the 16-year civil war.

Earlier this week Mozambique government forces seized a second military base of the former Renamo rebels, a week after raiding the group's main base.

Renamo had already staged several attacks in their central Mozambique heartland and in June warned that they would block the flow of goods and people along the country's main north-to-south highway.

Write to Alex MacDonald at alex.macdonald@wsj.com

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