Copenhagen: Denmark's richest man Anders Holch Povlsen and his wife lost three of their four children in the Easter Sunday attacks in Sri Lanka, a spokesman for Povlsen's fashion firm said on Monday.
The spokesman declined to give any further details but Danish media said the family had been on holiday in Sri Lanka.
A string of bombings at churches and luxury hotels across Sri Lanka killed 290 people and wounded about 500 in Sunday's attacks. A senior investigator said on Monday that seven suicide bombers had taken part in the attacks.
Povlsen is the owner of fashion firm Bestseller, which includes brands like Vero Moda and Jack & Jones, and is the majority stakeholder in online retailer Asos while also holding a big stake in Zalando.
He owns more than 1 per cent of all the land in Scotland, according to Forbes.
The government declared a curfew in Colombo and blocked access to social media and messaging sites, including Facebook and WhatsApp. It was unclear when the curfew would be lifted.
But in a sign that the attacks on three churches and four hotels could lead to communal violence, police reported on Sunday night that there had been a petrol bomb attack on a mosque in the northwestern district of Puttalum and arson attacks on two shops owned by Muslims in the western district of Kalutara.
Thirteen arrests have been made, all of whom are Sri Lankans, police said.
The government has acknowledged that it had "prior information" of attacks on churches involving a little known local Islamist group but didn't do enough about it.
Out of Sri Lanka's total population of around 22 million, 70 per cent are Buddhist, 12.6 per cent Hindu, 9.7 per cent Muslim and 7.6 per cent Christian, according to the country's 2012 census.
In February-March last year, there were a series of religious clashes between Sinhalese Buddhists and Muslims in the towns of Ampara and Kandy.