war. During these tensions, both the northern and southern armies (which had never integrated) gathered on their respective frontiers. The May – July 1994 civil war in Yemen resulted in the defeat of the southern armed forces and the flight into exile of many Yemeni Socialist Party leaders and other southern secessionists. Saudi Arabia actively aided the south during the 1994 civil war. Saleh became Yemen's first directly elected president in the 1999 presidential election, winning 96.2% of the vote. The only other candidate, Najeeb Qahtan Al-Sha'abi, was the son of Qahtan Muhammad al-Shaabi, a former President of South Yemen. Though a member of Saleh's General People's Congress (GPC) party, Najeeb ran as an independent. In June 2000, the Treaty of Jeddah was signed, defining the border with Saudi Arabia. In October 2000, seventeen U.S. personnel died after a suicide attack on the U.S. naval vessel USS Cole in Aden which was subsequently blamed on al-Qaeda. After the September 11 attacks on the United States, President Saleh assured U.S. President George W. Bush that Yemen was a partner in his War on Terror. In 2001, there was violence surrounding a referendum which apparently supported extending Saleh's rule and powers. The Shia insurgency in Yemen began in June 2004 when dissident cleric Hussein Badreddin al-Houthi, head of the Zaidi Shia sect, launched an uprising against the Yemeni government. The Yemeni government alleged that the Houthis were seeking to overthrow it and to implement Shī'a religious law. The rebels counter that they are "defending their community against discrimination" and government aggression. In 2005, at least 36 people were killed in clashes across the country between police and protesters over rising fuel prices. In the 2006 presidential election, held on 20 September, Saleh won with 77.2% of the vote. His main rival, Faisal bin Shamlan, received 21.8%. Saleh was sworn in for another term on 27 September. A suicide bomber killed eight Spanish tourists and two Yemenis in the province of Marib in July 2007. There was a series of bomb attacks on police, official, diplomatic, foreign business and tourism targets in 2008. Car bombings outside the U.S. embassy in Sana'a killed 18 people, including six of the assailants in September 2008. In 2008, an opposition rally in Sana'a demanding electoral reform was met with police gunfire. Al Qaeda In January 2009, the Saudi and Yemeni al-Qaeda branches merged to form Al-Qaeda in