World Bulletin / News Desk

Police swooped on a Swedish student’s flat this week after balloons celebrating her 21st birthday party as propaganda for ISIS . (Read backwards, the rounded numerals resembled the initials “IS.”)

Sarah Ericsson and her boyfriend Fabian Akesson put party balloons on their windows for her birthday party in the southern city Karlskrona. Akesson said police cars arrived Monday after a passer-by had reported a window display featuring ISIS propaganda, reports UPI.

“We understand why someone would report it if they thought it looked like IS-propaganda, although everyone else just thought it looked like the number ’12’ from outside,” Ericsson told Swedish media.

The couple removed the balloons, with the birthday girl saying that “extremism should always be taken seriously.”

“I laughed about it and they showed me a photo that they had taken where from their perspective, it did almost look like the letters IS,” Akesson said.

“I’m so surprised at all the attention,” Ericsson added. “I will never forget my 21st birthday.”