South Sudan’s authorities said an attack on a market in the disputed Abyei region killed at least 153 people. Abyei lies along the border between Sudan and South Sudan and has been the subject of competing territorial claims. The strike took place in a civilian market area, placing shoppers and nearby residents at risk. The authorities did not immediately name the attackers or provide a fuller account of how the attack unfolded. Nor had the notice, as published, explained what response followed. The notice did not say whether the death toll was expected to rise or whether the security situation in Abyei had changed.