South Sudan has accused Sudan of carrying out airstrikes on a disputed border town, just two days after the neighboring countries signed a non-aggression pact.

Authorities in South Sudan say Russian-made Antonov jets dropped several bombs on the town of Jau on Sunday, wounding at least four people.

South Sudan claims Jau is located inside its Unity state, while Sudan puts the town inside its own state of Southern Kordofan.

Disputes over borders and oil have raised tension between the two Sudans, and leaders on both sides have suggested the countries could go to war.

On Friday, an African Union mediation team persuaded the two Sudans to sign a non-aggression pact. The countries have accused each other of supporting the other's rebels, and the south says the north has bombed its territory on several occasions.

The AU is hosting talks in Addis Ababa aimed at settling the dispute over oil revenues, the biggest source of income for both countries.

South Sudan took 75 percent of Sudan's oil when it declared independence in July. But the landlocked south must rely on pipelines that run north to an export facility at Port Sudan.

The two sides are embroiled in a battle over how much money South Sudan should pay to use the pipelines and Sudan's export facilities.

The dispute prompted Khartoum to seize South Sudan's oil at Port Sudan. South Sudan responded by shutting down all oil production.