At least three paramilitary guards were killed Sunday when a suicide bomber on a motorbike blew himself up in Quetta, southwestern Pakistan, police said.The bomber targeted Frontier Constabulary guards in the Mian Ghundi neighborhood of the city — close to the Afghanistan border — where Hazara Shiite merchants were trading vegetables.Azhar Akram, a deputy inspector general of police, told AFP that 20 people were injured in the blast, including civilians.A spokesperson for the police’s Counter-Terrorism Department confirmed the toll.Shiite Muslims have been frequently targeted in restive Balochistan by radical Sunni Islamist groups, who consider them a heretical sect.Frontier guards have also been targeted by Baloch insurgents, who have been waging a simmering insurgency for greater autonomy. 
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