Andrew Parker is the first serving spy chief to give a newspaper interview.
Church bells rang out for the first time in two years in the town on the outskirts of Mosul.
Women told HRW they were drugged and raped or coereced into sex through false marriage promises.
The troops are about 3km away as they advance under heavy fire.
The involvement of Shia militias has shifted the focus of the battle.
Fears of attacks on US citizens as anti-American feelings remain high in Turkey following coup attempt
The offensive against Isis is in the town of Tal Afar, which was once a Shia majority region before it was captured by militants in 2014.
The UN say that families are being brought into Mosul to be used as human shields.
Both Iraqi and Kurdish forces have been criticised for their heavy-handed treatment of suspects.
General Joseph Votel says Isis still has a heavy presence around Iraq's second city.
The tunnels were found in the villages of Bartella and Bazaia, roughly four miles east of Mosul.
The operations to retake the Isis-controlled city will begin while the Islamists are under attack in Mosul.
In 2015, a faction of Somalia-based al-Shabaab terrorists pledged alliance to the Islamic State terror group
Pentagon Press Secretary Peter Cook said the 'precision strikes' targeted Faruq al-Qatani and Bilal al-Utabi.
Elite Iraqi forces are clearing areas retaken from Isis since the beginning of Mosul offensive
Al-Shabaab militants have recaptured three towns since Ethiopian troops withdrew in October.
Isis fighters distrust civilians with armed training as they attempt to crush any possible resistance.
The victims, mostly farmers, were kidnapped and shot dead to avenge the death of a militant commander.
An investigation carried out by the group suggests coalition forces failed to protect civilians.
The UN human rights staff received reports of extrajudicial killings and summary executions in the Mosul area.
Police say the pair praised those who fought for Islamic State in Iraq and Syria.
Isis has said its suicide bombers used assault rifles and grenades over the course of a four-hour assault.