India, Nov. 10 -- A fresh round of gang violence is brewing in the trans-Yamuna belt, putting both the Delhi Police and the city on edge.

The protagonists this time belong to two of northeast Delhi's most notorious groups - the Hashim Baba and Chhenu Pehalwan gangs - according to at least three officers familiar with the investigation.

The rivalry between the two gangs dates back decades. In June 2018, a fragile truce was brokered when gang leaders Abdul Nasir and Irfan alias Chhenu Pehalwan met at a local mosque to end years of bloodshed. The meeting, attended by relatives of both sides and several clerics, led to an agreement to divide territories and avoid interference in each other's operations.

For a while, the peace held. Skirmis...