Belgium’s Prime Minister Charles Michel reportedly said Friday that his country plans to conduct airstrikes against the Islamic State group as part of the U.S.-led coalition after ISIS’ deadly attacks in Brussels Tuesday. The news comes as U.S. Secretary of State John Kerry visited the Belgian capital to pay his condolences to the citizens in the wake of the bombings at the Brussels airport and metro station.

At least two Americans were killed during Tuesday’s attacks in Brussels that were claimed by ISIS, a U.S. official reportedly said, but did not reveal the identities of the Americans dead in the attacks. According to NBC News, the official also did not mention whether they were killed in the suicide bombings at the airport or at the attack in the metro.

At least four Americans have been missing since Tuesday’s attacks. Those unaccounted for include a husband and wife from the South America and a brother and sister from New York City.

Meanwhile, British officials reportedly confirmed Friday the death of Briton David Dixon in the Brussels terror attacks.

Speaking after meeting with Belgian Prime Minister Charles Michel, Kerry said the “United States is praying and grieving with you for the loved ones of those cruelly taken from us, including Americans, and for the many who were injured in these despicable attacks,” according to the Associated Press.

Kerry also took to his Twitter account to condemn the attacks saying that it “struck at the very heart of Europe.”

The Brussels attacks came just days after Belgian police captured the prime suspect of the Nov. 13 Paris attacks. Salah Abdeslam, who has been on the run for four months, has been in a high-security prison in Brussels. His lawyer Sven Mary said Thursday that his client “didn’t know” about the Brussels attacks.