Gunmen take 170 hostage in hotel in Bamako

Update: Six US citizens among those recovered in hotel

Update: Attackers dig in on seventh floor, gunfire heard

Update: U.S. military assisting in rescue - CNN

Update: French nationals held in Bamako hotel siege

Update: Six Turkish Airlines staff in hotel attacked

Update: Special forces storm hotel

Update: 80 hostages freed as special forces storm

Update: Hostage freed, says attackers spoke English

Two attackers have taken 170 people hostage in a luxury hotel in the Malian capital Bamako on Friday, the group that runs the hotel said.

"The Rezidor hotel group, which manages the hotel in Bamako, understands that a hostage-taking is under way at the site today," the group said in a statement quoted by the BBC.

The raid targeted the Radisson Blu hotel, located just west of the city centre in a neighbourhood that is home to government ministries and diplomats, they said.

Northern Mali was occupied by Islamist fighters, some with links to al Qaeda, for most of 2012. Although they were driven out by a French-led military operation, sporadic violence continues.

"Very early in the morning there was gunfire. Apparently it's an attempt to take hostages. The police are there and are sealing off the area," the security source said.

Witnesses in the area said police had surrounded the hotel and were blocking roads leading into the neighbourhood.

The U.S. Embassy tweeted that it was "aware of an ongoing active shooter operation at the Radisson Hotel," and instructed its citizens to stay indoors.

An Islamist group claimed responsibility for the death of five people last March in an attack on a restaurant in Bamako popular with foreigners.