Michael Foley said he felt his brother may have volunteered to be sacrificed to save other hostages.
Iceland's highest volcanic alert was issued after a small eruption began at the Bardarbunga volcano Saturday.
Thousands of peaceful demonstrators gathered on Staten Island Saturday to protest the death of Eric Garner, 43.
Other details about the grand jury could be released by Judge Carolyn Whittington at a hearing Monday.
Americans remain in Islamic State custody as U.S. considers striking ISIS strongholds in Syria.
German Chancellor Angela Merkel met with Ukraine President Petro Poroshenko during Kiev visit Saturday.
The WHO said that its efforts to contain the ongoing outbreak have been hindered due to the under-reporting of cases in affected nations.