US Senate candidate Elizabeth Warren’s campaign said today that she raised $6.9 million in the first three months of the year, continuing her staggering pace and doubling the figure collected by incumbent Scott Brown.

Brown, a Republican, said through his campaign on Friday that he raised $3.4 million in the first three months of the year, giving the Republican a total of about $15 million in the bank.

Warren’s campaign noted in an e-mail sent to supporters today that she still has $4 million less than Brown, who had money left over from his 2010 special election victory when he began fundrasing for his reelection campaign.

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But the latest numbers show that the likely Democratic challenger has continued to close that gap with surprising speed.

Warren has excited the Democratic base around the country, with her fiery defense of liberal economic policy. The majority of her contributions have come from out of state both this quarter and in previous quarters. Her campaign said that 83 percent of the donations were $50 or less.

Last week campaign officials announced that Warren collected $2.5 million in state during the first quarter of this year, which they have said is probably more than Brown has raised in Massachusetts.

“The incredible enthusiasm we have seen from people across the Commonwealth who are contributing to this campaign shows the strong grassroots momentum behind Elizabeth’s fight for middle class families,” said Warren campaign manager Mindy Myers.

Brown’s campaign today shot back, criticizing Warren for her out-of-state contributions.

“Professor Warren’s fundraising continues to be mostly out-of-state money from extremely liberal donors and special interests that are trying to influence the Massachusetts election,” said spokesman Colin Reed.

Brown has said about 71 percent of his contributions came from donors within Massachusetts. But he has not said how much money that represents.

The candidates are required by law to file full reports on their fundraising later this month.

Warren raised $5.7 million in the last three months of 2011 compared with Brown’s $3.2 million.