Iraqi Prime Minister Haider al-Abadi has formally declared victory over so-called Islamic State (IS) in Mosul.

Mr Abadi waved a national flag with troops after announcing the “collapse of the terrorist state of falsehood”.

Earlier, clashes were reported in a small part of Old City where a few dozen IS militants were holding out.

The battle for Mosul has taken almost nine months, left large areas in ruins, killed thousands of civilians and displaced more than 920,000 others.

Commanders from the US-led coalition that has provided air and ground support to Iraqi forces said the urban combat had been most intense since World War Two.