Mass killings of innocent citizens, abductions and other criminal atrocities would soon become history in Nigeria, President Muhammadu Buhari has said.The president made the pledge in his Easter message to the West African country on Sunday, Xinhua reported.He said that his administration was determined to achieve peace and security across the nation by ending the avoidable conflicts and crises that hindered national progress.The Nigerian leader added that already the nation's security apparatus were being reformed and empowered to win the war against terrorism and other criminal activities across the country.The president said the unfortunate incidences in recent years where the blood of men, women and children was wantonly and callously shed in frequent orgies of criminal, political, ethnic and religious violence had become embarrassing and unacceptable.