Nigeria rights group says over 500 killed in riots

LAGOS - More than 500 people were killed in post-election violence last week in the mostly Muslim north, a Nigerian human rights group said on Sunday, and it warned of further unrest during state elections.
Youths launched protests in northern towns and cities after President Goodluck Jonathan, a Christian from the south, was declared the victor of an April 16 election, defeating former military ruler and northern Muslim Muhammadu Buhari.
Observers and many Nigerians say the vote was the most credible in Africa's most populous nation for decades and world leaders have congratulated Jonathan. But Buhari says the count was rigged and his supporters have refused to accept defeat.
Nigeria's Civil Rights Congress (CRC) said more than 500 people were killed on Monday and Tuesday in three towns alone -- Zonkwa, Kafanchan and Zangon Kataf -- in the southern part of Kaduna state, one of the worst-hit areas.