“Following four anti-revolutionary elements’ attack on our country’s embassy in Copenhagen on the current day [Thursday], the ministry’s director for Northern and Eastern European affairs summoned the Danish ambassador to Tehran and strongly condemned this action which is contrary to the international regulations,” Iranian foreign ministry spokesman Bahram Qassemi stated, according to the pro-government Tehran Times.

According to several media outlets, Denmark's ambassador Ambassador Danny Annan was given a dressing-down over Denmark’s failure to provide the embassy and its staff with sufficient security. Iran also demanded that Danish authorities appropriately deal with the people involved in the attack.

Henrik Stormer at the Copenhagen police said six people had been arrested in the attack. Four of the suspects are thought to be Iranian nationals who have sought asylum in Sweden, as well as two others who hold Swedish residency.

It was the second time this year that Iran’s diplomatic mission in Copenhagen has been targeted in such an attack.

The suspects allegedly entered the embassy’s courtyard, taking down the Iranian flag and putting up profane banners and signs.

The Danish foreign ministry told Danish news agency Ritzau that it had been in contact with the Iranian embassy in Copenhagen.

“Obviously we regret the violations at the Iranian embassy and have expressed our sympathies with the embassy staff,” it said in written comment.

In January, six people were also arrested after forcing their way into the diplomatic premises to protest the Iranian regime.