A woman collapsed on a Bury line tram due to extreme weather conditions, the Manchester Evening News understands.
The Metrolink tram headed for Prestwich was forced to stop under the hot sun, with passengers complaining of no air conditioning.
Commuters reported that a woman had collapsed on board the tram, with widespread panic ensuing shortly after.
Metrolink confirmed a medical emergency on board a Bury line tram but have not released any further details on the incident.
It comes as temperatures rocketed in Greater Manchester amid a UK-wide heatwave.
All Metrolink trams were forced to go slower as a result of the hot weather, with severe disruptions to some services.
Meanwhile, trains departing and arriving at Manchester Piccadilly were heavily delayed due to the hot weather affecting overhead lines.
One commuter was travelling on the Bury line tram during Thursday evening rush hour.
Speaking to the M.E.N, she said: "The train stopped under the sun, inside there wasn't air-conditioning, the windows were really small, and the second time stopped for at least 20 minutes.
"We tried ringing the emergency button to call the driver because more people were feeling sick from the heat.
"The tram was fully packed with people. One person collapsed and we were still under the sun inside the tram without any air coming from the windows.
"We tried again ringing the emergency button, nobody answer.
"At that point I lifted the lever to open the door. The next stop a lot of people get off some of them stayed in.
"I don't know how the person who collapsed is doing now. However everyone was in panic and a mother with a three-year old child was shaking."
Another commuter said: "One person collapsed because the tram stopped for 15 minutes at least.
"It was fully packed of people and a lot went into panic. A mother with a baby started shaking.
Metrolink tweeted an apology to passengers stuck on board the tram, saying the delay was due to a medical emergency.
A spokesperson said: "I'm sorry to hear this, it was due to a medical emergency.
"You should be starting to move again soon. Please accept my apologies for any inconvenience caused."
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