Bamako, Mali - Gunmen near Mali's capital city of Bamako attacked a luxury resort popular with Westerners on Sunday, the U.S. State Department said.

On Twitter, the State Department warned people to avoid the area.

Mali's Ministry of Security and Civil Protection said in a statement that "armed individuals — certainly terrorists" attacked the Le Campement resort, noting that a Malian anti-terror force was on the scene.

A security official with the United Nations mission known as MINUSMA told the Associated Press that people had been killed and wounded, but gave no immediate death toll. There also were believed to be hostages in the luxury Campement de Kangaba resort area, the AP reported.

There was no immediate claim of responsibility for the attack, which came amid the final week of the Muslim holy month of Ramadan. In predominantly Muslim Mali, people have been fasting from sunrise to sundown for three weeks.

The European Union Training Mission in Mali said it was aware of the attack and was assessing the situation, CNN reported.

Sunday's violence came about a week after the State Department warned U.S. citizens of "possible future attacks" on locations in Bamako that Westerners frequent." The U.S. Embassy warning included what it said was an increased threat against Western diplomatic missions and places of worship, among others. "Avoid vulnerable locations with poor security measures in place, including hotels, restaurants, and churches," the warning noted.

Le Campement is located on the outskirts of the capital, about 30 minutes from downtown Bamako. It is also popular with expatriates who use its facilities to host business meetings.

The former French colony has been battling Islamist extremists for several years, CNN noted: In November 2015, gunmen raided a Malian hotel and killed at least 22 people, according to the U.N. Mission in Mali.

Contributing: AP; Follow Greg Toppo on Twitter: @gtoppo