Five people lost their lives while several others were wounded after an airplane dropped bombs in Rubkona, South Sudan on Saturday.

According to a military spokesman Col. Philip Aguer, the bombs hit a market area in the town at one pm, while another town  in the state, Abiemnom County, as well as two other counties, were also attacked.

But Al-Sawarmi Khalid, a spokesman for the Sudanese Armed Forces, says, “We have not carried out attacks into South Sudan.”

South Sudan gained independence from the north in July, the result of a referendum overwhelmingly approved by voters last year.

The referendum was part of a 2005 peace deal that ended decades of civil war between the two sides that killed about 2 million people.

When they separated, South Sudan acquired three-quarters of Sudan’s oil reserves. The two countries have been locked in negotiations over how much the landlocked South Sudan should pay to use a pipeline and processing facilities in the north.

In late July, South Sudan halted oil production after accusing Sudan of “stealing” $815 million worth of its crude. Sudan said it confiscated the oil to make up for unpaid fees.