The call was received around 8.45 PM, following which a thorough search was conducted at both Janakpuri East and West stations on the blue line of Delhi metro, but no suspicious object was spotted, police said.
"It was a hoax call and a case has been registered," DCP (Metro) Jitender Mani said.
Investigators soon tracked the caller and a team was sent to his residence in west Delhi's Sagarpur area.
He is being interrogated but why he made the hoax call could not be ascertained yet, police said.