Di Martino also revealed the investigation was spreading beyond Italian borders, with five people arrested in Hungary.
Timea Petroczi, a spokesperson from disaster relief services in Hungary, told AFP that people had been told not to use the wells, as a "precautionary measure".
At least 100, 000 people have rallied in Hungary's capital Budapest in support of embattled Prime Minister Viktor Orban and his government.
BBC: Thousands of Hungarians rally to back embattled PM Orban
The largest number of observers comes from Poland (212), 61 people come from Russia, 43 come from Hungary, and the United States is sending 42 observers.
The 350, 000-odd ethnic Hungarians (or Magyars), a fifth of Vojvodina's people, are a cause dear to the heart of Hungary's ruling centre-right, which came to power in last year's general election partly because it promised to do more to stand up for Magyars outside Hungary.
Currently, China has less than 100 vehicles per 1000 people, far below even relatively undeveloped economies like Mexico, Hungary, Poland and the Czech Republic.
On the contrary, Democracy will succeed in Iraq but only if the free nations of the West stand with the Iraqi people, support and help them the way we did the people of Romania, Bulgaria, East Germany, Poland, Hungary, the Czech Republic, Slovakia, the Baltics, and now Ukraine.
On the contrary, Democracy will succeed in Iraq -- but only if the free nations of the West stand with the Iraqi people, support and help them the way we did the people of Romania, Bulgaria, East Germany, Poland, Hungary, the Czech Republic, Slovakia, the Baltics, and now Ukraine.
With four factories the firm is now Hungary's third-biggest industrial company, employing some 4, 000 people and accounting for 8% of exports.
People have reportedly self-immolated in response to Communist regimes in Romania and Hungary, taxes in Sweden, the kidnapping of children by Chilean police.
But several people familiar with his thinking suggest that Soros who was born in Hungary, and who has made his fortune in global investments is currently preoccupied with other issues, such as the fate of the European Union, and is not inclined to take an outsized role in the 2012 Presidential campaign.
It held big, flag-waving rallies one attracted several hundred thousand people and told them that the free-market-minded Socialists would hand Hungary over to big business and (this for the farmers) let foreigners buy their land.
Marton Gyongyosi said Hungary had "become subjugated to Zionism, it has become a target of colonisation while we, the indigenous people, can play only the role of extras".
The executive branch and Congress owe it to the American people to take every step possible to avoid a "good money after bad" scenario in Poland and Hungary.
CENTERFORSECURITYPOLICY: Safeguarding US Equities While Aiding Poland And Hungary
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