Police said the uncle, Amit Singh, 22, is the prime accused, who up until his arrest pretended to be a well-wisher of the children’s family. Singh allegedly picked up the children from school and kidnapped them.
Mansij, 7, and his sister Yashvi, 5, were kidnapped on February 26 from outside their school in Mandawali and nine ransom calls demanding R30 lakh were made to their parents from nine different PCOs.
Prabhakar, DCP (east), said the suspects killed the children because their attempts to extort money failed and they realised it was difficult to keep the siblings with them for long. The little ones were strangled and smothered.
“They first tried to kill them in Millennium Park but eventually murdered them near Pragati Maidan,” he said. The others arrested are Shivan Gupta and Pankaj Kashyap, both 19.