Federal investigators have said that preliminary data showed an Amtrak train in Philadelphia was travelling at more than 100 miles (160km) per hour, or roughly twice the speed limit, when it derailed, killing seven people and injuring more than 200.

Protests across the United States against police killings of unarmed black men have continued, with calls for nationwide dialogue and a “die in” in one city.

Six people were killed when a building that was being demolished collapsed, raining bricks on a neighbouring charity shop and injuring at least 13 others.