The discovery comes after two packages laced with gunpowder targeted the International Monetary Fund in Paris and the German Finance Ministry.
Although the eight suspect packages did not specify who the recipients were, a security source said they were "addressed to officials at economic institutions and companies" at various European countries.
Police said: “Eight suspect packages which listed as recipients persons in European countries were located and confiscated today.
Police and a soldier block the access to the International Monetary Fund last week
Two packages were sent to the IMF in Paris
A Greek urban guerrilla group that sent letter bombs to foreign embassies in Athens and European leaders in 2010 is thought to be behind the attacks.
A package containing a book concealing the explosives and addressed to German Finance Minister Wolfgang Schaeuble was intercepted by German authorities last week.
An administrative assistant was left injured after a letter addressed to the International Monetary Fund in Paris exploded.
A Greek militant group, Conspiracy of Fire Cells claimed responsibility for the first suspect package sent to Germany and intercepted on March 15.
However it hasn’t claimed responsibility for the letter to the IMF that exploded on March 16, but authorities assume the same group is behind it.
In both cases, the packages listed as senders members of the New Democracy opposition conservative party.
Bomb threat outside Paris financial court Mon, March 20, 2017 Play slideshow AFP/Getty Images 1 of 6
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French police officers stand guard at a cordoned off area in front of the financial crimes court building (pole financier du tribunal de grande instance) following a bomb alert in central Paris on March 20, 2017
Greece has a long history of urban guerrilla group attacks.
Conspiracy of Fire Cells initially conducted arson attacks but turned to bombings in 2009.
The group has become prominent since the economic crisis erupted in Greece and is accused by police of carrying out more than 150 criminal acts.
In November the group said that its plan, which it called "Nemesis", was designed to "spread fear into the yards of the homes of our enemy".