<p><br /> Hospital staff say 45 people have been killed and 93 others wounded in a wave of violence which has brought much of Pakistan's commercial capital Karachi to a standstill.<br /> </p><p><br /> Dozens of vehicles and shops were set on fire as security forces struggled to gain control.<br /> </p><p><br /> Schools and colleges were ordered by the government on Tuesday to close.<br /> </p><p><br /> The violence came after Raza Haider was shot dead along with his bodyguard in a mosque in the city while preparing to offer prayers on Monday.<br /> </p><p><br /> Local government officials said at least ten people were arrested, and that police and Army Rangers were dispatched throughout the city to impose order.<br /> </p><p><br /> The southern city of more than 16 million has a history of political, ethnic and religious violence, and has long been a hide-out for al-Qaida and Taliban militants. Its stability is considered paramount for Pakistan, because it is the country's main commercial hub.<br /> </p>
