In Rig Veda (RV.6.27.4 & 5) it is described that Indra killed people of Varasikha and drove away VRcis in the aid of Abhyavartin Cayamana. Ralph T.H Griffith's translation follows :-
4 This one great power of thine our eyes have witnessed, wherewith thou slewest Varasikha's children, When by the force of thy descending thunder, at the mere sound, their boldest was demolished.
5 In aid of Abhyavartin Cayamana, Indra destroyed the seed of Varasikha. At Hariyupiya he smote the vanguard of the Vrcivans, and the rear fled frighted
Is there any scripture elaborating this story? Who were Varasikha and Abhyavartin Cayamana?