Activists formed a human chain on London's Oxford Street to mark the first anniversary of the Rana Plaza disaster in Bangladesh and expose the failure of major retail chains to compensate survivors and victims' families.

Campaigners from Labour Behind the Label and War on Want, joined by trade union activists, gathered outside Gap's flagship branch in Oxford Street to commemorate the 1,138 garment workers who died at a clothing factory building just outside Dhaka in Bangladesh exactly one year ago.

Activists were demanding that all brands buying from Rana Plaza pay into a fund set up by the UN's International Labour Organisation (ILO). The target is $40m (£24m) but only $15m has been raised. A number of brands whose clothes were found in the rubble of the factory, including Benetton and Matalan, have not contributed to the fund.

Both companies said they preferred to support alternative assistance programmes for victims.

Walmart, represented in the UK by Asda, has paid $1m compared to more than $7m by Primark.

"We're here to remember the 1,100 victims of Rana Plaza building collapse and make sure those brands and retailers who have been making millions of pounds of profit on the backs of those workers take responsibility for the lives and the safety of the workers," Jeff Powell of War on Want told IBTimes UK.

Gap, which is one of the largest buyers of clothing from Bangladesh, had paid a "paltry sum" to the fund, the Rana Plaza Arrangement, Powell said.

The firm also refused to sign the Bangladesh Accord for Fire and Building Safety, a legally binding mechanism that brings together unions, the Bangladeshi government and 150 retailers to ensure another Rana Plaza disaster does not happen.

The accord, whose signatures include Tesco, Primark, and Zara-owner Inditex, has been co-signed by 10 unions and challenges companies which do not live up to their commitments.