DAKAR, Senegal (AP) — The U.S. government on Tuesday sanctioned an armed group accused of illicit trading in minerals in eastern Congo as Washington tries to spearhead peace efforts there while pushing for U.S. access to the region’s minerals.

The United States has sanctioned an armed group accused of illicit mining in the Democratic Republic of the Congo (DRC), as both the army and the Rwandan-backed M23 rebel group traded accusations of violating a recently reached US-mediated ceasefire deal by attacking each other’s positions.

The US has sanctioned Congo’s PARECO armed group, mining firms, and Hong Kong exporters over illicit coltan trade, as renewed clashes threaten peace talks.