The UN voiced "serious concern" about the Taliban’s persistent threat after the group killed seven people in two suicide attacks in Kabul Thursday, including one targeting a play at a French-financed high school.

The UN voiced "serious concern" about the Taliban's persistent threat after the group killed seven people in two suicide attacks in Kabul Thursday, including one targeting a play at a French-financed high school.

The warning comes with the Afghan capital having been hit by a series of deadly attacks in recent weeks, highlighting the fragility of security as foreign combat troops leave after more than a decade of war.

The late afternoon bombing at the Istiqlal High School, attached to the city's long-established French cultural center, killed a foreign national and came just hours after another suicide attack on a bus carrying Afghan troops in the capital's suburbs killed six soldiers.

The bomber killed a foreign national and wounded at least seven people, according to Kabul police official General Farid Afzail, who added that the perpetrator is thought to have been a teenager.

French Foreign Minister Laurent Fabius, however, said the "barbaric" attack had left several people dead.

The United Nations Security Council issued a unanimous statement condemning the attacks which also voiced "serious concern at the threats posed by the Taliban, al-Qaida and other terrorist and extremist groups, and illegal armed groups."