Image copyrightGetty ImagesImage caption Many of those targeted are MPs in Germany's Bundestag Hundreds of German politicians including Chancellor Angela Merkel have had personal details hacked and published online, reports say.Contacts, private chats and financial details were put out on Twitter which belong to figures from every political party except far-right AfD.Data from celebrities and journalists also appear to have been leaked.It is unclear who was behind hack, which emerged on Twitter last month in style of an advent calendar.How extensive was attackThe true extent of damage caused by leak is not yet known although Justice Minister Katarina Barley said it was a "serious attack".

"The people behind this want to damage confidence in our democracy and institutions," she said.

Germany's federal office for information security (BSI) said it was investigating hack and said government networks were not affected, as far as it was aware.

The national cyber-defence centre convened a meeting on Friday morning.Although no politically sensitive documents appear to have been published, sheer extent of personal data leaked suggests consequences could be considerable, says RBB reporter Michael Götschenberg, who researched hack.The Twitter account, followed by 17,000 people, appeared to be linked to an internet platform based in Hamburg, he said.

Although documents had been posted on account last month, it was not until Thursday evening that officials became aware of hack.

Bild newspaper said all data stolen in attack dated back to before October 2018 but it was not clear when it began.Who was targetedNational and local political figures as well as some TV personalities have had their details hacked.

According to reports, among those hit were:Chancellor Angela Merkel: her email address and several letters to and from chancellor appear to have been publishedThe main parliamentary groups including ruling centre-right and centre-left parties, as well as The Greens, left-wing Die Linke and FDP.

Only AfD appears to have escapedGreens leader Robert Habeck, who had private chats with family members and credit card details posted onlineJournalists from public broadcasters ARD and ZDF as well as TV satirist Jan Böhmermann, rapper Marteria and rap group K.I.ZAnother TV satirist, Christian Ehring, had 3.4 gigabytes of data stolen and posted online, including holiday photos.

Last year he won a court case brought by AfD leader Alice Weidel, who complained when he called her a "slut" on his TV show.Centre-left SPD MP Florian Post said he felt "quite shocked" by leak of account statements and other details online, but he added that at least one file that had been posted was fake.German politicians have been targeted before.

Russia was accused of a series of cyber attacks that stole data from computers in German parliament, Bundestag, in 2015.Last year German government's IT network came under a fresh attack amid reports that Russian hackers were also to blame.