Conversation so far:
What is Davao death Squad?
The Davao Death Squad (DDS) is a vigilante group in Davao City, with connections to former Davao mayor, and current Philippine president, Rodrigo Duterte.
why did the davao death squad kill?
the DDS have conducted summary executions of street children and individuals suspected of petty crimes and drug dealing.

Question: How many were killed?
Self-contained rewrite: How many were killed by the DDS?