He said the battle to capture the Iraqi city was designed to support Clinton's presidential bid.
Barack Obama warns of potential for "significant" displacement in Iraqi city as offensive continues.
The Syrian army and its allies see a risk that Islamic State will regroup in eastern Syria as it is forced from the Iraqi city of Mosul.
The rights group has accused government forces and militias of serious human rights violations.
Julian King said returning jihadis pose a "serious threat that we must prepare ourselves for."
The campaign is being spearheaded by U.S.-backed ground forces.
Dabiq figures prominently in ISIS propaganda as the site of a future battle between Muslims and infidels that will presage doomsday.
Attacks target a Shi'ite gathering, police checkpoint and the family of a Sunni paramilitary leader opposed to ISIS.
In a message to besieged ISIS fighters in former stronghold Manbij, a commander tells them not to come back alive.
A commander sought to switch sides and deliver the city to government forces.
The Pentagon had earlier reported his death in a strike near Raqqa last month.
The Iraqi leader told citizens that his forces "will raise the flag of Iraq in the center of Mosul."
Even if ISIS is crushed, any celebration should be short-lived.
Jean-Yves Le Drian's comments come after the French air force conducted airstrikes against the group.
Wahida Mohamed boasts of brutality after the murders of her two husbands, brothers and father.
Obama can draw comfort from a bottomless reservoir of public indifference toward the rape of Aleppo.
The international community needs to provide double what it has pledged for the Mosul fallout, humanitarians warn.
The bombing shows the continued threat that the Islamist group poses to the Iraqi capital.