France, March 24 -- Chad's President Mahamat Idriss Deby last week ordered the army to prepare to retaliate after a cross-border drone attack from Sudan killed 17 people in Chad, including mourners attending a funeral service.

He vowed to retaliate against any further attacks.

The border town of Tine was struck on Wednesday afternoon as mourners gathered at a house for a funeral ceremony, a local resident said. There were two explosions and casualties included mourners and children who had been playing nearby, said the resident, who declined to be identified for security reasons.

Local government sources said it was not immediately clear who was behind the attack.

Sudan conflict worsening with mass killings and fam...