US soldiers are wearing masks to protect against sulphur fumes.
The Arabic 'meem' symbol spray-painted on Mosul's walls is the most visible sign of resistance to Isis rule.
Isis militants stormed the city at dawn today, killing at least 19 people in a bid to divert attacks on Mosul.
Defiant Alghad Radio connects the people trapped inside Mosul with the outside world.
Iraqi PM said operations going quickly as Kurdish troops and the Iraqi army advance into Mosul.
Secretary of Defence Michael Fallon said the military was launching the online attacks against IS.
Fighting is concentrated on a cluster of uninhabited towns and villages littered with roadside bombs planted by Daesh.
It is believed around 5,000 IS fighters in Mosul are being used as suicide bombers to halt advances.
Lieutenant General Talib Shaghati told reporters he was calling on militant group to surrender its positions.
Landmines and booby traps suggest the advance into Mosul will be slow and dangerous.
IBTimes UK reports from northern Iraq as Peshmerga advance column probes Islamic State's last bastion.
Amnesty International's new report details abuses suffered by Sunni Arabs fleeing Isis-controlled areas.
An Isis commander revealed that some fighters are willing to 'hand themselves over to the kuffar'.
Freeing what is known as the crown jewel in the Islamic caliphate can end Isis' stronghold in northern Iraq.
Kurds, Shia and Sunni forces are fighting together but they may struggle to stay united
The UN is bracing for the world's biggest humanitarian effort in the battle for Mosul, which could leave up to a million people homeless.
Defeat for Isis would effectively flush them out of Iraq, officials say.
Commander Omer Huseyin claimed US howitzers have started bombing the northern Iraqi city.
Doctors worried Simpson was poisined in the same way as murdered Alexander Litvinenko.
The claims were made in new book SAS Who Dares Wins: Leadership Secrets From The Special Forces.
The lunchtime attack in the Shaab neighbourhood wounded at least 60 more.
Daesh forces have constructed an elaborate tunnel system as they prepare for final stand.