Heavy fighting along the border between Sudan and Chad has killed at least 17 people and left dozens seriously wounded, according to Doctors Without Borders.

The clashes on Monday in Tina have left 66 people in critical condition, many of whom are receiving treatment across the border in Chad. Medical teams said they were struggling to cope with the influx of casualties.

Sudan's army said the paramilitary Rapid Support Forces (RSF) had intensified attacks on military positions in Tina, but claimed its troops repelled the assault and forced the fighters to withdraw.

The violence is part of the ongoing conflict between the army and the RSF, which erupted in April 2023 and has since killed tens of thousands of people. According to the United Nations, more than 40,000 people have died, though aid groups say the toll is likely higher.

Tina remains one of the last areas in the Darfur region still under military control, after much of the area fell to RSF forces in 2025. The nearby Tina crossing has been a key route for humanitarian aid deliveries from Chad.

However, Chad recently closed its border with Sudan "until further notice" in a bid to prevent the conflict from spilling over.

Medical staff in Chad said they were treating the wounded in extremely difficult conditions, with limited supplies, no reliable electricity, and dwindling stocks of medicine. Facilities are relying on generators and solar power to continue operations.

The wider war has heavily impacted regions such as Darfur and Kordofan, where escalating violence, including drone strikes, has further endangered civilians and disrupted humanitarian efforts.