Authorities on Monday searched all incoming and departing trains at the busy New Delhi railway station after an anonymous caller warned a bomb would go off.
The search spread across the 16 platforms began after a telephone call was received at 4.10 am and went on for about five hours. The caller said the bomb was placed inside one of the trains, a senior railway official said.
The Government Railway Police and Railway Protection Force carried out the search, Northern Railway spokesperson Neeraj Sharma told.
On Sunday evening, security agencies were sent into a tizzy after an Air Asia pilot reported sighting a drone-like flying object leading flight operations at Delhi airport to be briefly halted, police said.