A petition that demands Tony Blair is held to account over the Iraq war has passed a parliamentary milestone by attracting more than 10,000 signatures.

This means that the UK Government is obliged to issue an official reply.

Following the damning £10 million Chilcot report into the Iraq war and its consequences, which spoke of "flawed intelligence" and a "far from satisfactory" legal basis for the war, renewed calls were made for the former Prime Minister to face legal action.

Alex Salmond, the former First Minister, who unsuccessfully sought to impeach Mr Blair in 2004, insisted there would be a “reckoning” for the former Labour premier. Lawyers for the relatives of the fallen made clear they would scrutinise the report with a view to possible court action.

The petition says: "The Chilcot Report has presented a range of evidence that demonstrates that Parliament and the country were misled by Tony Blair in the run-up to the war in Iraq. Parliament should now agree a process by which it can hold the former Prime Minister to account."

"This is a significant milestone for this parliamentary petition,” declared SNP MP Tasmina Ahmed-Sheikh .

“Now it has received 10,000 signatories the UK Government is required to make a formal response on the issue; the next step is to press for 100,000 supporters, which would lead to a parliamentary debate on the topic,” she explained.

The MP for Ochil and South Perthshire said she would continue to work with MPs from across the Commons, who wanted to see the UK Parliament act to “address this serious issue”.

She added: "If we are to retain the public's confidence in Parliament, we must hold Tony Blair to account for the misleading statements he made in the run-up to the war in Iraq."

Adama Price, the Plaid Cymru Welsh Assembly member, added: "As the damning Chilcot Report clearly demonstrates, Blair is guilty of a litany of errors and failures. He must face his day of reckoning if justice is to be served to all of those who suffered at his hands."

Meantime, families of British troops killed in the Iraq War have raised nearly £125,000 as they pursue separate legal action against Mr Blair and other leading officials.