WASHINGTON - The United States on Monday imposed sanctions on an international Hamas fundraising network, accusing it of playing a critical role in external fundraising for the Palestinian militant group, in action marking the first anniversary of the Gaza war.

The U.S. Treasury Department in a statement said it imposed sanctions on three people and what it called a 'sham charity' that it accused of being prominent international financial supporters of Hamas, as well as on the Al-Intaj Bank in Gaza that it said was controlled by the group.

Also targeted was a longstanding Hamas supporter, a Yemeni national living in Turkey, and nine of his businesses, Treasury said.

"As we mark one year since Hamas's brutal terrorist attack, Treasury will continue relentlessly degrading the ability of Hamas and other destabilizing Iranian proxies to finance their operations and carry out additional violent acts," Treasury Secretary Janet Yellen said in the statement.

"The Treasury Department will use all available tools at our disposal to hold Hamas and its enablers accountable, including those who seek to exploit the situation to secure additional sources of revenue."

In their rampage through Israeli towns and kibbutz villages near the Gaza border a year ago, Hamas-led militants killed some 1,200 people and took about 250 hostages back to Gaza, according to Israeli figures.

The huge Israeli security lapse led to the single deadliest day for Jews since the Nazi Holocaust, shattered many citizens' sense of security and sent their faith in its leaders to new lows.

The Hamas assault unleashed an Israeli offensive on Gaza that has largely flattened the densely populated enclave and killed almost 42,000 people, Palestinian health authorities say.

The Treasury on Monday said: 'Hamas has exploited the suffering in Gaza to solicit funds through sham and front charities that falsely claim to help civilians in Gaza,' adding that as of early this year, the group may have received as much as $10 million a month through such donations. The Treasury said Hamas considers Europe to be a key source of fundraising.

Monday's action targeted an Italy-based Hamas member the Treasury said established the sham Charity Association of Solidarity with the Palestinian People, which it accused of helping bankroll Hamas' military wing.

Also targeted was a senior Hamas representative in Germany and a Hamas representative in charge of the group's activity in Austria.

Hamas is a U.S. designated terrorist group.

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