A British imam with hundreds of thousands of followers on Facebook has declared the murderer of a politician who stood up for Pakistani Christians a "martyr".

In a post to almost 136,000 people, Imam Muhammed Asim Hussain said Mumtaz Qadri killed Salman Taseer "in honour of the Prophet".

Qadri was sentenced to death for the murder of Salman Taseer in 2011, a politician who strongly opposed the country's blasphemy laws, often used to target Christians.

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