A CRPF jawan shot dead three of his colleagues from his service rifle inside a camp in Jammu’s Udhampur and later shot himself on Wednesday evening. The jawan, identified as constable Ajit Kumar, killed head constable Pokarmal, resident of JhunJhunu in Rajasthan, head constable Yogender Sharma, resident of Maujpur in Delhi and head constable Umeed Singh, resident of Rewari in Haryana.