One person was killed Saturday, 13 were hospitalized and one woman was missing after a large explosion caused a partial collapse of a Vienna apartment building, Austrian emergency services said.

A 19-year-old man died shortly after being pulled from the rubble around five hours after the still-unexplained blast, while a 50-year-old woman was still unaccounted for, police spokeswoman Adina Mircioane told Agence France Presse.

Austrian prosecutors have launched an investigation into members of ousted Ukrainian president Viktor Yanukovych's government on charges including money-laundering, officials said Monday.

Although the names and positions of those under investigation have not been released, the investigation will look at those who were close to Yanukovych, who fled into exile in Russia after a four-month uprising in the Ukrainian capital Kiev.

Austrian Foreign Minister Sebastian Kurz will travel to Israel and Iran later this month, the ministry announced on Wednesday, as talks on Tehran's disputed nuclear program ended in Vienna.

"A date has not been set but the trip to Iran will probably be in late April," ministry spokesman Martin Weiss told Agence France Presse.

Swiss authorities said Friday they have launched a criminal probe into alleged money laundering by ousted Ukrainian leader Viktor Yanukovych and his multi-millionaire son.

The government also announced it was freezing the assets of 20 Ukranian officials, including Yanukovych and his son Olexandr and a number of former ministers in his government.

Austria's president has been invited to Iran, his office said Wednesday, in what would be the first visit by a Western head of state since President Hassan Rouhani's election.

"Yes it is correct that the president (Heinz Fischer) has been invited to Iran," spokeswoman Astrid Salmhofer told Agence France Presse. She declined to comment on whether the invitation would be accepted.

Austrian actor Maximilian Schell, who won an Oscar for best actor in 1961 for "Judgment at Nuremberg," has died at the age of 83, his agent announced Saturday.

Schell died following "a sudden and serious illness," agent Patricia Baumbauer said.

Thousands of people rallied in Vienna Friday to protest against the staging of an annual ball hosted by an extreme right party in a palace in the heart of the Austrian capital.

State television network ORF estimated 10,000 people took part in the three protest marches. Police put the number at less than 6,000. No crowd violence was reported, only some minor incidents.

Polls opened Sunday in Austria's general election, with the country's two-party centrist coalition likely to stay in power but possibly with their worst result ever.

A week after neighboring Germany handed Angela Merkel's Christian Democrats 41.5 percent of votes, Austria's Social Democrats (SPOe) and conservative People's Party (OeVP) can only wish for such a result -- despite both trying to model themselves on the German chancellor.

Normally peaceful Austria was in shock Wednesday after a poacher killed three policemen and a paramedic before perishing in a fire at his farm surrounded by police marksmen and army tanks.

The drama began just after midnight on Tuesday when police commandos tried to stop Alois Huber near Annaberg, some 100 kilometers (60 miles) west of Vienna, after a tip-off that he was hunting illegally.

Police commandos and army tanks surrounded an Austrian poacher's farmhouse on Tuesday after he allegedly went on a killing spree that left three policemen and a paramedic dead.

The 55-year-old was holed up with an arsenal of hunting guns in his home at Grosspriel near Melk, some 90 kilometers (55 miles) west of Vienna, police spokesman Johann Baumschlager said.