Opposition sources say the car bomb in Aleppo hit an area close to a local security office. The Syrian Observatory for Human Rights said the explosion had killed and injured people in the area but gave no estimate on the number of casualties.
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Labour is promising to reverse the Conservative policy of privatisation in the NHS which it claims is creating longer waiting times.
The Queen and senior members of the monarchy will attend services around the world to commemorate the centenary of the battle of Gallipoli.
The Liberal Democrats have proposed to invest an extra £10 million in mental health care for military personnel