A suicide bombing at a restaurant popular with foreigners in Kabul, Afghanistan, killed 21 people, including three Americans. The Taliban has claimed responsibility and says the attack was a reprisal for an air strike that killed civilians

A suicide bombing at a restaurant popular with foreigners in Kabul, Afghanistan, killed 21 people, including three Americans. The Taliban has claimed responsibility and says the attack was a reprisal for an air strike that killed civilians

KABUL, Afghanistan -- The American University of Afghanistan says that two of its U.S. employees were among those killed in a Taliban attack on a popular Kabul restaurant that left 21 people dead, including 13 foreigners.

"We are all deeply saddened by the events Friday evening," read a message sent to the university's students obtained by CBS News. "It was a vicious attack on innocent people at a restaurant in Kabul."

Michael Smith, president of the private nonprofit institution, said Saturday that families of the victims were being informed and arrangements being made to send their remains home.

An Afghan policeman stands near a damaged car outside a Lebanese restaurant, the site of a suicide attack, in Kabul Jan. 18, 2014. Reuters/Omar Sobhani

One of the victims was Alexis Kamerman, a Chicago native.

Get Breaking News Delivered to Your Inbox

According to the Chicago Tribune, her family released this statement via an email from Kamerman's aunt Julie Pfeffer:

"First of all the world called her Lexie-

She was an amazing young woman –smart, strong, beautiful, funny, stubborn and kind. And fearless.

She took the job at the American University of Afghanistan to help the young women of Afghanistan get an education and take their rightful place as leaders in Afghan society.

As you could probably guess, Her death is a shock to us all and we can't imagine a moment going forward when she won't be desperately missed."

The university, which has more than 1,000 students, was established in 2006 and has a number of Americans on its staff.

Late Saturday, a State Department spokesperson told CBS News that the U.S. Embassy in Kabul had confirmed that a third American was also killed in the attack.

The attack is the deadliest violence against foreign civilians in the country since the start of the war nearly 13 years ago.

Kabul police chief Gen. Mohammad Zahir Zahir said the victims included 13 foreigners and eight Afghans and said the majority were civilians.

The dead at the La Taverna du Liban restaurant included the head of the International Monetary Fund in Afghanistan, three United Nations staff and a member of the European Police Mission in Afghanistan. The U.N. had initially reported four dead, but had counted the IMF representative.

Zahir and international officials said the dead included two Britons, two Canadians, a Dane, a Russian, two Lebanese, a Somali-American and a Pakistani. At least four people were wounded and about eight Afghans, mostly the kitchen staff, survived.

Five women, four foreign and one Afghan, were also among the dead, Zahir said.

The three attackers, including a suicide bomber and two gunmen, were also killed during Friday night's assault on the Lebanese restaurant.

The dead included the head of the IMF in Afghanistan, Wabel Abdallah, a 60-year-old Lebanese national; a Danish European Policewoman and her British bodyguard, while the U.N. in Kabul said its three staff members included a Pakistani, a Russian and a Somali-American. The restaurant's Lebanese owner, Kamal Hamade, was also killed.

The attack was condemned by the U.N. Security Council, NATO and the European Union.

"I strongly condemn this attack on random civilians and my thoughts and deepest sympathy goes to the next of kin," Danish Prime Minister Helle Thorning-Schmidt said in a statement.

The Danish Foreign Ministry declined to release details about the victim as customary but Denmark's TV2 said she was a 34-year-old woman.

"I condemn in the strongest possible terms this appalling and unjustifiable violence. The perpetrators must be brought to justice," EU High Representative Catherine Ashton said Saturday.

Afghan President Hamid Karzai's office has not yet condemned the attack.

The Taliban claimed responsibility for the attack, saying it was in reprisal for an Afghan military operation earlier in the week against insurgents in eastern Parwan province, which the insurgents claimed killed many civilians. The Taliban frequently provide exaggerated casualty figures.

"The target of the attack was a restaurant frequented by high ranking foreigners," Taliban spokesman Zabihullah Mujahid said in an emailed statement. He said the attack targeted a place "where the invaders used to dine with booze and liquor in the plenty."

He described the "revenge attack" as having delivered a "heavy admonitory blow to the enemy which they shall never forget."

During the operation last Wednesday in eastern Parwan province, Afghan officials said that Taliban fighters opened fire on an Afghan commando unit trying to capture an insurgent leader in his home. After opening fire on the Afghan soldiers, killing one of their American advisers, the team called the U.S.-led coalition for air support.

The governor of Parwan, Abdul Basir Salangi, said a Taliban leader, three of his family members and five civilians in a neighboring home, from which insurgents were also firing on the Afghan commandos, died in the ensuing combat. He added that seven Taliban fighters were also killed.

Insurgents have frequently targeted foreign interests around the country and in Kabul.

The deadliest previous attack against foreign civilians was in Sept. 8, 2012, when nine civilian employees of a private aviation company were killed in a suicide attack happened near Kabul airport. They included eight South Africans and a Kyrgyz.

The Taliban have stepped up a campaign of violence in recent months after foreign forces handed over control of security for the country to the Afghan army and police ahead of their full withdrawal by the end of 2014.