Hindu couples gathered at the Laxmi Narayan Mandir near the Netty Jetty bridge yesterday night to celebrate the occasion.
On Karwa Chauth, Hindu women, especially in North India and Gujarat, traditionally observe day-long fast for longevity and well-being of their husbands. They break their fast after sighting the moon through a sieve.
Mehndi and heena are used for body arts by women during the festive season.
Rani, who broke her fast on the footsteps of the mandir which overlooks the Netty Jetty waters said for her and many other Hindu married women the annual festival had become very important because of its religious significance.
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"We have Karwa Chauth and we fast because it means it will keep our husbands safe and protected throughout the year and that is now very important in Karachi," she said.
The law and order in Karachi which is the country's financial hub has spiralled out of control in recent times with an increase in street crimes, muggings, target killings and kidnappings and gang wars.
As per tradition, as soon as the moon peeks through the clouds, these women glance at it through a sieve and then look through it at their husbands.
The man will then offer his wife some water and something sweet to break the fast.