A Kenyan court ruled Thursday that the government must not close the world's largest refugee camp and send more than 200,000 people back to war-torn Somalia, a decision that eases pressure on Somalis who feared the camp would close by the end of May.

Kenya's internal security minister abused his power by ordering the closure of Dadaab camp, Judge John Mativo said, adding that the minister and other officials had "acted in excess and in abuse of their power, in violation of the rule of law and in contravention of their oaths of office."

Rights groups Amnesty International, Kituo cha Sheria and the Kenyan National Commission on Human Rights had challenged the government's order to close the camp, which has operated for more than a quarter-century.

Kenya's government quickly said it will appeal the ruling. "Being a government whose cardinal responsibility is first to Kenyans, we feel this decision should be revoked," spokesman Eric Kiraithe said.

The judge called the order discriminatory, saying it goes against the Kenyan constitution as well as international treaties that protect refugees against being returned to a conflict zone.

President Uhuru Kenyatta's government has not proved Somalia is safe for the refugees to return, the judge said, also calling the orders to shut down the government's refugee department "null and void."

Somalia remains under threat of attacks from homegrown extremist group al-Shabab. Some Kenyan officials have argued that the sprawling refugee camp near the border with Somalia has been used as a recruiting ground for al-Shabab and a base for launching attacks inside Kenya. But Kenyan officials have not provided conclusive proof of that.