Sudan escalated Thursday its attacks on South Sudan, dropping five bombs on a major town which is the capital of the oil-producing Unity border state, Southern officials told AFP.

"They dropped bombs in Bentiu town -- apparently they were aiming for a bridge," South Sudan's deputy information minister Atem Yaak Atem informed AFP.

The bombing occurred at dawn and targeted a strategic bridge on the edge of Bentiu, which is approximately 60 kilometers from the frontier. The bombing continued three consecutive days of violence between the countries.

The most recent fighting is the worst since South Sudan won independence in July and is bringing the nations closer to a return to civil war. Prior to independence, the sides had fought one of Africa's longest civil wars.

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