A general strike has spread across the country to protest a 50-percent increase in consumer oil prices, causing lengthy flight delays at major airports and unrest in Lagos, and the closure of government offices and businesses in Abuja, the northern cities of Kano and Kaduna and the southeastern city of Port Harcourt. Police fired warning shots and tear gas to disperse protesters in Lagos, and shops were barricaded for fear of looting. The price hike was announced June 20 and met with outrage. Union leaders are determined to maintain the strike until the price increase is rescinded or reduced, and more unrest is possible.