Swedish police investigate 'explosion,' find shirtless man hanging curtains

STOCKHOLM, Sweden, Nov. 6 (UPI) -- What was briefly believed to be a terrorist attack in Sweden turned out to be no more than a household accident.

Police, ambulances and the fire-department rushed to Södermalm in Stockholm after receiving reports of a loud boom and a shirtless man seemingly brandishing a weapon at around 11:40 a.m.

Police canvassed the area, but found no damage to any of the surrounding property or any other evidence that would hint at an explosion.

The lone oddity was a man hanging a piece of plastic in his window. Swedish tabloid Aftonbladet reports that a tactical operations team approached the man but quickly backed down after he produced a hand-written note.

"The apartment owner had a broken window, it doesn't seem to be connected to any bang. He was at home himself putting up curtains," police spokesperson Albin Näverberg told local television station SVT, according to The Local.

Authorities shut down the street for a time, but promptly reopened it after no threat was found.

The Aftonbladet report states that the man in the window had dropped his power drill while attempting to hang curtains. The drill shattered the window and went on to land on a tin roof below producing the loud noise.