भिडियो हेर्न माथि क्लिक गर्नुहोस।
A Nepalese diplomat confirmed the deaths hours after images were put on a website, apparently showing one man being beheaded and 11 being shot dead.
Nepal's ambassador to Qatar, Shyamanand Suman, said it was one of the "worst days" in his country's history.
The militants said the 12 Nepalis had been killed because they "came from their country to fight the Muslims and to serve the Jews and the Christians".
The group, Army of Ansar al-Sunna, said the men were being punished for helping the US, and it had "carried out the sentence of God" against them.
Mr Suman told Radio Nepal that he did not yet know all the details of the killings but did believe the men were dead.
This is the largest number of hostages being executed by Iraqi Militants after the fall of Sadaam Hussein.It is very sad to hear such news. Iraqi Militants executed our 12 Nepalese. We would like to express our condolence to all the family members. May the departed soul rest in peace. Please accept our prayers...
