A U.S. backed Syrian coalition of Kurdish and Arab groups have made advances into Raqqa the de facto capital of the so-called Islamic State group.
IS has suffered a series of setbacks in recent months at the hands of an array of Syrian and Iraqi forces.
"Since the offensive began, the SDF have captured around 25 percent of the city's built-up neighbourhoods", Rami Abdel Rahman, head of the Syrian Observatory for Human Rights, told AFP on Monday.
Cihan Shekh Ehmed, a spokeswoman for the USA -backed militia known as the Syrian Democratic Forces, said the group's fighters seized the western district of al-Qadisiya from IS on Monday.
Supreme Court rules for Missouri church in playground case
Chief Justice John Roberts said that it "is odious to our Constitution" to exclude the church from the grant program. The Missouri Constitution's ban on aid to religious schools is similar to provisions in another 36 states.
From those neighbourhoods, they were bearing down on Raqqa's Old City in a pincer movement on Monday, with fighting raging in the western al-Qadisiya district and parts of the city's east.
The battle for Raqa is the SDF's flagship offensive, with heavy backing from coalition air strikes, advisers, weapons and equipment.
The report of the gains comes on the same day that US -led Iraqi government troops reported major advances against IS in Mosul, the group's capital in Iraq and its last stronghold in that country.
It became infamous as the scene of some of the group's worst atrocities, including public beheadings, and is thought to have been a hub for planning attacks overseas.
- Rabbi, several others arrested in public benefits fraud case
- ASL Airlines France inaugure son Paris-Alger — Algérie
- Low turnout but big majority ahead for Macron
- Décès de l'ancien Premier ministre, Habib Thiam — NÉCROLOGIE
- Amnesty warns that May-DUP negotiations must not undermine abortion law reform
- Nantes: "Il faut oublier ce que j'ai fait avec Leicester" prévient Ranieri
- Foo Fighters make joyous return to Glastonbury
- Olivia Wilde's new play has audience members fainting, vomiting and getting arrested
- Supreme Court allows parts of travel ban to go into effect
- The Case for and Against The Home Depot, Inc. (HD)