Police chief and two security officials resign over Capitol assault

Steven Sund and House and Senate sergeants-at-arms quit after criticism of bungled policing efforts

The head of the US Capitol police and two other senior security officials are resigning amid mounting criticism of the bungled police response to the assault on Capitol Hill by a violent mob of Donald Trump supporters.

Steven Sund's resignation will be effective from 16 January, and follows calls by the House speaker, Nancy Pelosi, and other senior figures for heads to roll.