Swedish Foreign Minister Tobias Billstrom on Thursday said the storming of the Swedish embassy in Baghdad earlier on Thursday was "totally unacceptable."
"It is clear that the Iraqi authorities have seriously failed in their responsibility to protect diplomatic missions and personnel," Billstrom said in a statement.
Hundreds of protesters stormed the Swedish embassy in Baghdad in the early hours of Thursday morning and set it on fire, a source familiar with the matter and a Reuters witness said, in a protest against the expected burning of a Quran in Sweden.
The source said no embassy staff had been harmed and declined to elaborate further. Swedish embassy officials in Baghdad did not immediately respond to requests for comment.
A Swedish foreign ministry spokesperson declined to comment.
Thursday's demonstration was called to protest the second planned Quran burning in Sweden in weeks by supporters of Shi'ite cleric Muqtada Sadr, according to posts in a popular Telegram group linked the influential cleric and other pro-Sadr media.
Swedish news agency TT reported on Wednesday that Swedish police granted an application for a public meeting outside the Iraqi embassy in Stockholm on Thursday.
Books and buildings burned
The application says the applicant seeks to burn the Quran and the Iraqi flag, TT reported.
Two people were set to participate in the demonstration, according to TT, adding one of the people was the same person who set a Quran on fire outside a Stockholm mosque in June.
A series of videos posted to the Telegram group, One Baghdad, showed people gathering around the embassy around 1 a.m. on Thursday (2200 GMT on Wednesday) chanting pro-Sadr slogans and storming the embassy complex around an hour later.
"Yes, yes to the Quran," protesters chanted.
Videos later showed smoke rising from a building in the embassy complex. Reuters could not independently verify the authenticity of the videos.
It was not immediately clear if anyone was inside the embassy at the time of the storming.
Late last month, Sadr called for protests against Sweden and the expulsion of the Swedish ambassador after the Quran burning in Stockholm by an Iraqi man.
Swedish police charged the man with agitation against an ethnic or national group. In a newspaper interview, he described himself as an Iraqi refugee seeking to ban the Quran, the central religious text of Islam, believed by Muslims to be a revelation from God.
Two major protests took place outside of the Swedish embassy in Baghdad in the aftermath of that Quran burning, with protesters breaching the embassy grounds on one occasion.
The governments of several Muslim countries, including Iraq, Turkey, the United Arab Emirates, Jordan and Morocco issued protests about the incident, with Iraq seeking the man's extradition to face trial in the country.
Iraq is condemning the burning of the Swedish embassy in Baghdad "in the strongest terms," the Iraqi foreign ministry said on Thursday.
The Iraqi government has instructed security forces to conduct a swift probe into the incident and hold perpetrators accountable, the foreign ministry said in a statement.
The United States also condemned it, but added that Sweden's issuing of the permit supported freedom of expression and was not an endorsement of the action.
The Swedish foreign ministry said staff at its embassy in Iraqi capital Baghdad "are in safety" after the embassy was stormed and set alight in Baghdad in protest against the expected burning of a Quran in Sweden on Thursday.
The Swedish foreign ministry's press office also told Reuters that Iraqi authorities have the responsibility to protect diplomatic missions and staff.
Iraq tells Sweden it will cut ties if Koran burned again
Iraq said on Thursday it had threatened to cut diplomatic ties with Sweden if a Koran is burned again.
"The Iraqi government has informed the Swedish government through diplomatic channels that any recurrence of the incident involving the burning of the Holy Koran on Swedish soil would necessitate severing diplomatic relations," an Iraqi government statement said.
It added that Iraq considered the storming of the Swedish embassy in Baghdad a security breach that 'must be immediately addressed'.
US condemns attack in Swedish Embassy, criticizes Iraqi security
The United States on Thursday strongly condemned the attack on the Swedish Embassy in Baghdad over the planned Quran burning in Stockholm and criticized Iraq's security forces for not preventing protesters from breaching the diplomatic post.