Bangladesh factory collapse: police detain owners, as death toll rises to 352

                                        Rescue workers carry out a survivor found 78 hours after the building collapsed

Police in Bangladesh have detained two factory owners for criminal negligence over the deaths of at least 352 workers at an eight-storey building that collapsed on Wednesday – a day after warnings had been given that it was unsafe.

Two engineers who had been involved in issuing building permits for the Rana Plaza complex in Savar, just north of Dhaka, were also being held. The owner of the building was being sought by police, who have put border authorities on alert and arrested his wife in an attempt to bring him out of hiding.

On Saturday around 30 survivors were found and police say that as many as 900 people remain missing, trapped dead and alive under the twisted steel and concrete, through which rescue teams were still searching last night using electric drills, shovels, crowbars and their bare hands. Anger at the collapse has sparked days of protests and clashes, with police on Saturday using teargas, water cannon and rubber bullets on demonstrators who burned cars.

In London, demonstrators gathered outside Primark's flagship store in Oxford Street after it emerged that the chain used a floor of the Savar building. A petition has been launched calling for Primark and other brands, including Matalan and Mango, which used the factories, to compensate the families of workers killed or injured.