Following the US-led 2003 invasion of Iraq, a civil war, mainly between the Erbil and Dohuk-based Kurdistan Democratic Party (KDP) and the Sulaymaniyah-based Patriotic Union of Kurdistan (PUK) led to the establishment of two separate Kurdish regional governments. Following the reconciliation and a power-sharing agreement between KDP and PUK, and Parliamentary elections in 2005, a unified Kurdistan Regional Government was created. The joint KDP–PUK faction Democratic Patriotic Alliance of Kurdistan assumed power and formed a government that was headed by Nechervan Barzani (KDP; 2006–09) and Barham Salih (PUK; 2009–12).