US Secretary of State Marco Rubio told Lebanese President Joseph Aoun by phone that returning confiscated explosives to Hezbollah should be "out of the question," and demanded accountability for those responsible.
Lebanese security forces seized hundreds of kilograms of explosives last week. Hezbollah parliament member Hassan Fadlallah acknowledged the material belonged to the group and was intended for use against Israel.
The issue is sensitive amid ongoing security tensions between Lebanon and Israel.