On 26 January 2001, a devastating earthquake centred near Bhuj, measuring 6.9 on the richter scale, struck the city. As many as 50 multistoried buildings collapsed killing 752 people. The following year, a three-day period of violence between Hindus and Muslims in the western Indian state of Gujarat, known as the 2002 Gujarat violence, spread to Ahmedabad; refugee camps were set up around the city and economy was affected. Sabarmati Riverfront project started in 2004. The 2008 Ahmedabad bombings, a series of seventeen bomb blasts, killed and injured several people. Militant group Harkat-ul-Jihad claimed responsibility for the attacks. Ahmedabad BRTS was inaugurated in 2009. The construction of Ahmedabad Metro began in 2015 and the operation began in March 2019.