Updated

An international rights group says dozens of global clothing companies are not complying with a plan to ensure better safety in Bangladesh garment factories following the deadly collapse of a building four years ago.

Human Rights Watch said in a report Monday that only 29 out of 72 recently contacted companies are releasing information about how they source their products in Bangladesh. It said many brands have held out completely.

Bangladesh's garment industry has invested more than $1 billion in safety improvements since April 24, 2013, when the Rana Plaza garment factory complex collapsed outside Dhaka, killing more than 1,130 workers and injuring 2,500.

The collapse highlighted grim conditions in the country's garment industry, the second largest in the world with about 4,000 factories employing about 4 million workers.