DEVELOPING: Parliament is in lockdown after reports that a mysterious ‘white powder’ was found inside a letter to a peer triggering fears of a chemical attack. Police are preventing people from goining in or out of the House of Lords where peers are still sitting. Experts are frantically trying to establish what the powder is and whether the substance poses any threat to health. Security experts have been scrambled to the scene.

A Metropolitan Police spokesman said in a statement to “Police were called at approximately 12:30pm on Thursday to reports of a suspicious package that had been delivered to the Houses of Parliament. FULL REPORT