VIOLENCE ERUPTS: Soldiers moved into a northern Nigeria city, where a state governor had to be evacuated by helicopter after protesting youths went on a rampage, attacking his residence and setting an election commission office on fire.
FUELING THE PROTEST: The unrest comes as Nigerians across the country take part in demonstrations following the government's decision to end a popular gas subsidy program that kept gas prices cheap for more than two decades. Tens of thousands have protested across the country since a national strike started Monday.
OIL SUPPLY RISK: Unrest could affect oil production in Nigeria, which produces about 2.4 million barrels of oil a day and is a top crude supplier to the U.S. Most fields remain unmanned while offshore oil fields continue to provide much of the country's crude capacity.