The Obama administration said Monday it has released another 10 prisoners from the Guantánamo detention center to the Gulf nation of Oman. Many of those released were held for about 15 years without trial and had been cleared for release awaiting a nation that would accept them. It’s expected the prison will house about 40 prisoners when President Obama leaves office later this week. President-elect Trump has vowed to expand the number of prisoners held in Guantánamo.