The charity said suspected Fulani militants attacked Christian worshippers in Nimdem village, Southern Kaduna, Nigeria.
The Christians were singing Christmas carols around 10:00 p.m. when gunmen struck, killing four and injuring 10. The four who were killed were named Jude Haruna, Turaki Dauda, Kaffi Ali, and Amos Musa.
In a press statement released by the Southern Kaduna People's Union (SOKAPU), the group lamented, saying: "We have once again come under unprovoked and gruesome attack two days before Christmas."
"This has left us wondering why people who had gathered peacefully for joyful Christmas carols in their village should be gunned down for no reasons."
Confirming the attack, a local pastor, Gideon Mutum, said it happened "during an interdenominational carol that comes every Christmas with Bible quiz, drama, songs and preaching" and added that those critically injured were receiving treatment in different hospitals.
ICC said these attacks have become all too common for unsuspecting villagers in Nigeria's Middle Belt.
In 2017, there were more than 100 attacks on Christian villages by Fulani militants that left more than 200 innocent Christians massacred. Southern Kaduna, the state where this attack took place, has been one of the central locations of the violence in Nigeria.
Last year, the Fulani militants launched a similar attack on Goska village on Christmas Eve, killing five women and burning down several houses.
ICC's Regional Manager, Nathan Johnson said: "The government in Nigeria must find a way to control the rampaging Fulani militants who have wreaked havoc on Christian farmers in central Nigeria.
"The devastation that they have wrought has left hundreds dead, and thousands without homes. If they are left unchecked, many more Christians will be left wondering, 'When will it be me?'"
