New York state’s top prosecutor raised the pressure on Barclays on Wednesday, alleging the bank hasn’t cooperated with an investigation into the activity of high-speed traders in its “dark pool” and naming specific employees who allegedly were involved in wrongdoing.

New York Attorney General Eric Schneiderman , who sued the British bank in June, said in an amended civil complaint Tuesday that Barclays had defied subpoenas seeking the testimony under oath of the two top executives running the bank's equities electronic trading division, which oversees its dark pool.