The Justice Department inquiry is said to be focused on potential antitrust violations among the country’s largest egg producers.

The high price of eggs and whether producers have conspired to raise prices is under investigation by the U.S. Department of Justice, the Wall Street Journal reported citing people familiar with the matter.

The Justice Department has opened an investigation into the cause of soaring egg prices, including whether large producers have conspired to raise prices or hold back supply, according to people familiar with the matter.