A relative of two PIA flight passengers said he spoke to his father on the phone after the plane landed at Stansted Airport.
Zohaib Sattar said his father Abdul told him there was "no warning or threat" before the flight was diverted.
Zohaib Sattar said: "They have taken two people off the plane and are checking the plane all over.
"The rest are just sat there waiting for further information.
"My father said there was no warning or threat, all of a sudden the plane just turned around".
More top news
A new scam aimed at people who own Apple iPhones steals their account information through a text.
Tomorrow’s Congress is expected to be dominated by claims of North Korea’s nuclear prowess.
The acclaimed conductor will direct the Mariinsky Theatre's Symphony Orchestra at the UNESCO World Heritage Site.