A Mumbai-Hyderabad SpiceJet flight with 140 passengers on board today landed under emergency conditions at the city airport after the pilot noticed a smoke alarm from the cargo hold.

The aircraft, SG-401, which took off from Mumbai airport at around 5.30 am returned and landed safely at 6.05 am here.

"The pilot on board SG-401 observed the smoke alarm in the cargo hold. Following the standard safety procedures and checklists, the captain activated the fire extinguisher in the cargo hold and requested for priority landing," SpiceJet said in a release issued here.