WASHINGTON (CBSDC) — Offices belonging to Jeffrey Thompson, one of the District’s biggest political contributors, were raided by law enforcement officials on Friday.

DC Chartered Health Plans Inc., which is owned by Thompson, manages one of the District’s largest contracts.

An FBI official confirmed some action was taken, but declined to go into specifics.

Bill Miller, a spokesman for the U.S. Attorney’s Office, confirmed to All-News 99.1 WNEW that the raids were part of an ongoing investigation.

“Law enforcement activities were conducted today as part of an ongoing investigation,” Miller stated. “We can confirm that there were no arrests today and that no charges have been filed as of this time. Due to the ongoing nature of our inquiry, we are unable to comment any further about today’s developments.”

Thompson’s donations to politicians and their campaigns total in the hundreds of thousands of dollars according to the Washington City Paper.

Through his companies, their employees and other businesses and sources linked to Thompson, approximately $630,000 in direct campaign contributions were given over the past decade the paper states. An additional $100,000 was given to political action committees and constituent services funds.

At-Large Councilmember Vincent Orange received more than $100,000 in donations from Thompson’s network during that span.

Former Mayor Adrian Fenty’s re-election campaign was given more than $50,000.

Current mayor Vincent Gray received $74,000 from Thompson’s contributor network when he was running for mayor, the paper reports.

Thompson’s personal contributions totaled nearly $30,000.

It is unclear whether his contributions were connected to the law enforcement raid on Friday.