A maniac slashed three elderly people with a machete in an unprovoked attack and was fatally shot by cops at Grand Central Terminal Saturday morning, police said.

An 85-year-old man, a 70-year-old woman and a 65-year-old man were slashed on the 4, 5, 6 subway platform at the iconic station at 9:50 a.m., cops said.

The victims were taken to local hospitals in stable condition, cops said.

The man with the machete, who wasn’t identified by cops, was killed, police said.

Two officers were also taken to the hospital in stable condition for treatment of unknown injuries, cops said.

This is a developing story. Please check back for updates.