It was the deadliest in a series of attacks in the oil-rich Abyei border region since 2021.
Dozens of people have been reported killed in attacks in conflict areas in Sudan and South Sudan.
Local authorities announced on Monday that a total of 52 people, including women and children, were killed in the Abyei region over the weekend. Sudan and South Sudan both claim oil-rich areas along their shared border.
Abyei Information Minister Brice Koch reported that armed youths from South Sudan's Warrap state attacked neighboring Abyei on Saturday.
This was the deadliest in a series of border dispute-related attacks since 2021. In addition to those killed, 64 people were injured in the attack.
A Ghanaian peacekeeper from the Abyei Interim Security Force (UNISFA) was killed when his base in Agok town was attacked during the violence, the United Nations force said on Sunday.
“I have imposed the curfew because the current dire security situation is causing fear and panic,” Koch said.
Tensions have been high in Abyei recently, with clashes between rival Dinka factions over the location of the administrative boundary, which is a source of significant tax revenue.
Mr. Koch said a force of Dinka youth from Warrap and Nuer rebel leaders carried out attacks against Dinka and Nuer people in Abyei.
Hundreds of civilians are currently taking shelter at UNISFA bases.
Warrap State Information Minister William Wal said his state government would coordinate a joint investigation with the Abyei administration to investigate the deadly incident.
From 2013 to 2018, South Sudan's civil war raged between Dinka and Nuer tribes, leaving thousands of people dead.
Clashes between various armed groups have continued to kill and displace large numbers of civilians, especially since South Sudan sent troops to Abyei last March.
Even after South Sudan gained independence from Sudan in 2011, ownership of the Abyei region remained unresolved.
An African Union commission proposed a referendum on the oil-rich region, but there was disagreement over who could vote.
