The headquarters of the Swedish Security Service in Stockholm was evacuated on Friday, with several people taken to hospital after a possible gas leak.
A perimeter of 100 m around the headquarters was cordoned off and a "handful" of people were taken to hospital, some of whom were police, after detecting an odour at the scene, according to the police web page.
Police later said the cordon had been lifted.
Minister of Justice Gunnar Strommer told TT news agency that the government was following the situation and in contact with the Security Services.
Earlier on Friday, Swedish Prime Minister Ulf Kristersson held a joint news conference with Hungarian counterpart Viktor Orban as the Hungarian parliament is set to ratify Sweden's NATO application next week - the only remaining hurdle before Sweden can become member of the military alliance.
Government offices, schools and workplaces fell silent in Sweden at midday on Tuesday in remembrance of the victims of a mass shooting at an adult education centre last week when a gunman killed 10 people before turning his weapon on himself.
UN Secretary-General Antonio Guterres urged Hamas to continue with the planned release of hostages on Tuesday, a day after the group announced its intention to halt the exchange.
US President Donald Trump substantially raised tariffs on steel and aluminum imports to a flat 25 per cent "without exceptions or exemptions" in a move to aid the struggling industries but which increases the risk of a multi-front trade war.
Armed rebels killed more than 35 civilians during an attack on a cluster of villages in eastern Democratic Republic of Congo's Ituri province on Monday night, a village chief said on Tuesday.
A teacher accused of stabbing an 8-year-old student to death at an elementary school in the central city of Daejeon has said she was "annoyed" at being excluded from a class, police said Tuesday.