New Delhi, June 13 -- A savage knife attack on a Northern Ireland street set off two nights of fiery riots stoked by anti-migrant rhetoric.

The suspect, a 30-year-old Sudanese man who had claimed asylum in the United Kingdom, has been charged with attempted murder, threatening to kill a second person and carrying a knife.

Protests over the attack flared into violence in Belfast and several other areas. Masked men set fire to several homes they believed to house immigrants, torched a bus and pelted police with rocks and other objects.

The government said more than two dozen people lost their homes and 12 police officers were injured in what Northern Ireland Secretary Hilary Benn on Thursday called "racist thuggery."

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