Pakistani security officials say at least 81 people have been confirmed dead after bombers attacked Christian worshippers in Pakistan’s northwestern city of Peshawar.Over 131 others were injured when blasts ripped through a church in the violence-wracked city. The bombs went off when worshippers were coming out of the church on Sunday. No group has claimed responsibility for the bombings, but pro-Taliban militants have been blamed for previous attacks on Pakistan’s Christian minority. Security forces have cordoned off the area, kicking off a search operation, but local reports say a group of protesters vandalized a police makeshift post outside the church and set police uniforms on fire. On Monday, Christians took to the streets across Pakistan to show their anger at Sunday's terrorist attack in in the troubled northwestern region. Protests took place in several cities including the capital, Islamabad, Karachi, Lahore and Multan. Protesters in Islamabad blocked the main highway to the city’s airport. In Karachi, the protesters vandalized public property, with police making arrests. Police there used tear gas to disperse the demonstrators. The Pakistani government has announced three days of mourning. Thousands of Pakistanis have lost their lives in bombings and other militant attacks since 2001, when Pakistan entered an alliance with the United States in the so-called war on terror. Thousands more have been displaced by the wave of violence and militancy sweeping across the country.