At least 20 people, most of them policemen, were killed and over 50 injured on Thursday when a suicide bomber blew himself up at a busy thoroughfare near the high court here.

The explosion ripped through GPO Chowk near the Lahore High Court at 11.45 am (local time) while a large number of policemen were taking up position in the area ahead of a protest march by lawyers against the regime of President Pervez Musharraf.

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