The man regarded as the "father of Pakistan's nuclear bomb", Dr Abdul Qadeer Khan, has died aged 85 after being hospitalised with Covid-19.
Dr Khan was hailed as a national hero for transforming his country into the world's first Islamic nuclear power.
But he was also notorious for having smuggled nuclear secrets to states including North Korea and Iran.
Prime Minister Imran Khan said Pakistan had lost a "national icon".
"He was loved by our nation because of his critical contribution in making us a nuclear weapon state," the prime minister tweeted.
Known as AQ Khan, the scientist was instrumental in setting up Pakistan's first nuclear enrichment plant at Kahuta near Islamabad. By 1998, the country had conducted its first nuclear tests.
Coming shortly after similar tests by India, Dr Khan's work helped seal Pakistan's place as the world's seventh nuclear power and sparked national jubilation.
But he was arrested in 2004 for illegally sharing nuclear technology with Iran, Libya, and North Korea.
The revelations that he passed on nuclear secrets to other countries shocked Pakistan.
In a televised address, Dr Khan offered his "deepest regrets and unqualified apologies".
Dr Khan was pardoned by Pakistan's then-president, Pervez Musharraf, but he was held under house arrest until 2009.
The leniency of his treatment angered many in the West, where he has been dubbed "the greatest nuclear proliferator of all time".
But in Pakistan he remained a symbol of pride for his role in boosting its national security.
"He helped us develop nation-saving nuclear deterrence and a grateful nation will never forget his services," President Arif Alvi said.
Latest Stories
-
The influence Ronaldo has on people, Cadman Yamoah will have same on the next generation – Coach Goodwin
33 mins -
Gender Advocate Emelia Naa Ayeley Aryee Wins prestigious Merck Foundation Awards
2 hours -
South Africa bursary scandal suspects granted bail
2 hours -
Ecobank successfully repays $500m Eurobond due April 18
2 hours -
Re: Doe Adjaho, Torgbui Samlafo IV, call for Unity among Paramountcies in Anlo
2 hours -
Extortion and kidnap – a deadly journey across Mexico into the US
2 hours -
Rihanna says fashion has helped her personal ‘rediscovery’ after having children
2 hours -
Development Bank Ghana targets GH¢1bn funding for commercial banks in 2024
3 hours -
Shatta Movement apologises to Ghana Society of the Physically Disabled after backlash
3 hours -
Sammy Gyamfi writes: Tema-Mpakadan Railway Project; A railway line to nowhere
4 hours -
Bright Simons: Is the World Bank saving or harming Ghana?
4 hours -
CAF Cup: RS Berkane banned from entering Algeria because of a map of Morocco with its Sahara
4 hours -
The media isn’t doing what is expected of journalism – Sulemana Braimah
5 hours -
Truck driver who caused train accident jailed 6 months
5 hours -
Music review: Okyeame Kwame proves rap dexterity on ‘No Competition’
5 hours