Walgreens is suing Theranos for $140 million

Walgreens is suing blood testing startup Theranos months after ending its partnership with the embattled company.

Walgreens Boots Alliance filed a civil suit for $140 million in a Delaware federal court Tuesday, The Wall Street Journal reported.

Walgreens had been a major partner for Theranos as the drug store chain operated several dozen testing centers for the startup. Walgreens ended its relationship with Theranos in June following a series of regulatory investigations and revelations that some of its tests were inaccurate.

In a statement posted to its website Tuesday, Theranos fired back at Walgreens saying the company was "disappointed" and that Walgreens had caused Theranos and its investors "significant harm."

We are disappointed that Walgreens filed this lawsuit. Over the years, Walgreens consistently failed to meet its commitments to Theranos.  Through its mishandling of our partnership and now this lawsuit, Walgreens has caused Theranos and its investors significant harm.  We will respond vigorously to Walgreens’ unfounded allegations, and will seek to hold Walgreens responsible for the damage it has caused to Theranos and its investors.

Details surrounding the lawsuit weren't immediately clear -- the Wall Street Journal reports it was filed under seal -- but Walgreen is reportedly hoping to recoup some of its $140 million-investment in the company.

The suit is the latest blow to the startup, which last month announced it would cut hundreds of jobs and close its wellness centers and clinical labs.