A Muslim civil rights organization has asked the U.S. Treasury Department to investigate JPMorgan Chase & Co. for closing bank accounts of U.S. Arabs and Muslims.

The Southfield-based Council on American-Islamic Relations' Michigan chapter sent a letter Wednesday to the Treasury Department's Office of the Currency. The letter says CAIR and other organizations have received "a series of complaints" about Chase closing accounts.

Read back: Group: Arab-Americans' bank accounts being closed

The Associated Press reached a JP Morgan Chase spokeswoman who said she was unaware of the complaints but would look into them. A message also was left with a Treasury Department spokeswoman.

Another civil rights group sent a letter in March to the Justice Department alleging similar actions by several banks.

CAIR says it's concerned the accounts are considered risky because of the holders' religion or ethnicity.