SHANGHAI, July 7 (Xinhua) -- A stabbing spree that killed six police and injured another four in Shanghai last week was revenge for a lengthy interrogation last year, the local police authority said on Monday.

    Yang Jia, an unemployed 28-year-old from Beijing, was apprehended by police at 8:30 p.m. on Oct. 5, 2007, a Shanghai Municipal Public Security Bureau official said. He was then interrogated for six hours for riding an unregistered bike in the city's Zhabei District.

    He was taken in after he refused to show his identification card and bike registration. Yang was released at 2:30 a.m. on Oct.6 after the police confirmed the bike had been rented by him.

    A torrent of e-mails sent later show Yang was disgruntled about the treatment he had received. He asked the authority to dismiss the relevant policemen involved and compensate him, the official said...

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