WASHINGTON: Hillary Rodham Clinton used a private e-mail account for her official government business when she was secretary of state and did not routinely preserve and turn over those e-mails for government records collection, the State Department said on Monday.

Clinton has turned over thousands of e-mails to the department from her private account, a step that was first reported by the New York Times late on Monday. The private account came to light when the department sought records from Clinton and other former secretaries who have held the post during the e-mail age.

Some 300 of Clinton’s recovered e-mails were then turned over to a congressional committee investigating the 2012 deaths of four Americans at US facilities in Benghazi, Libya, State Department spokeswoman Jen Psaki said.

“Last year, the Department sent a letter to representatives of former secretaries of state requesting they submit any records in their possession for proper preservation,” Psaki said in a statement. “In response to our request, Secretary Clinton provided the Department with e-mails spanning her time at the Department. After the State Department reviewed those e-mails, we produced about 300 e-mails responsive to recent requests from the Select Committee.”

A spokesman for Clinton did not immediately respond to a request for comment on Monday night. The spokesman, Nick Merrill, told the Times that Clinton has complied with the “letter and the spirit” of federal rules on the retention of official documents.

It was not clear why Clinton, a potential 2016 presidential candidate, created the private account. But the practice appears to bolster long-standing criticism that Clinton and her husband, former president Bill Clinton, have not been transparent.

“Hillary Clinton should release her e-mails,” said Kristy Campbell, a spokeswoman for former Florida governor Jeb Bush, who is also weighing a presidential bid. “Hopefully, she hasn’t already destroyed them.”

Campbell noted that Bush created a website, www.jebe-mails.com, providing public access to his electronic communications while in office. “Governor Bush believes transparency is a critical part of public service and of governing,” she said in a statement.

Clinton’s aides reviewed tens of thousands of pages of her personal e-mails and decided which ones to turn over to the State Department, the Times reported. In total, 55,000 pages of e-mails were turned over, the newspaper reported.

Clinton was not the first secretary of state to use a private account. The State Department said Clinton’s successor as top diplomat, John Kerry, is the first secretary to use a standard government e-mail address ending in “state.gov.”

Psaki played down the effect of Clinton’s use of a private account.