Thousands of prison officers walked out on Tuesday in protest at rising levels of violence in jails, prompting the government to seek a court injunction to force them back to work.
At least 25 inmates were killed, including six who were decapitated and burned, in clashes between rival criminal factions at a prison in northeastern Brazil, local media reported.
Britain will isolate Islamist extremists in special units in high security jails to limit their ability to radicalise other inmates, the government said on Monday.
Inmates burnt down two buildings at a southern Thai jail during a six-hour riot that left three prisoners dead and several officials injured, authorities said on Saturday.
