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The official also said it was possible, that like the November Paris attacks, the attack in Jakarta combined the use of “inspired” elements in Indonesia as well as militants taking some direction from Islamic State leaders in Syria and Iraq.
The United States condemned the attacks "in the strongest possible terms." A White House statement said the U.S. will stand by its strategic partnership with Indonesia and "the Government of Indonesia as it works to bring those responsible for this barbaric terrorist attack to justice and build a more secure future."
Attack condemned
Secretary of State John Kerry also condemned the assault. "We stand together, all of us, united in our efforts to eliminate those who choose terror," Kerry told reporters in London.
U.N. Secretary General Ban Ki-moon expressed solidarity with Indonesia's people.
Indonesian President Joko Widodo, speaking to a local television station, condemned the "acts of terror," stressing authorities are working to contain the situation.
"Our nation and our people should not be afraid. We will not be defeated by these acts of terror. I hope the public stays calm," said the president, who visited the bombing scene later in the day.
Indonesia, the world's largest Muslim-majority nation, has been the target of several terrorist attacks, most notably the 2002 Bali bombings that killed 202 people, mostly foreign tourists.
Before Thursday, the last attack against foreigners was a twin hotel bombing in Jakarta in 2009.
Jakarta has long been warning about the threat of recruitment by Islamic State and other extremist groups. Hundreds of Indonesians are believed to have left to fight with Islamic State in Syria and Iraq.