He says there are likely to be the same problems that caused the country's Supreme Court to annul the first election's results.
Several sailors have been relieved of their duties after the June shipwreck that killed seven U.S. Navy crew members.
The Red Cross says more than 300 people were killed near the city of Freetown when a rain-soaked hillside collapsed early Monday local time.
Right now, an estimated 15 million Yemenis don't have access to basic health care.
The State Department said it is "saddened and horrified" by the recent deaths of seven White Helmet volunteers in Syria.
Officials told reporters the attack started Sunday night in the country's capital and lasted several hours.
Raila Odinga refuses to accept election results he claims were manipulated.
Egypt's railway authority said a train traveling from Cairo to Alexandria slammed into the back end of another.
According to the Missouri State Highway Patrol, officer Gary Michael was shot after stopping a driver near the town of Clinton.
Lt. Aaron Allan and another officer were at the scene of a flipped car Thursday afternoon when gunshots rang out, striking Allan multiple times.
Tension continues to mount in Venezuela as the country prepares for a controversial vote that could rewrite its constitution.
Afghan officials say a U.S. airstrike killed 16 police officers Friday.