A pro-Palestinian man is in custody after allegedly killing two Israeli embassy staffers outside the Capital Jewish Museum in Washington, D.C. late Wednesday. Police said the victims were a young couple who were about to be engaged.

Rodriguez’s charges were laid out in a criminal complaint. He was informed by U.S. Magistrate Judge Matthew Sharbaugh during an initial appearance in federal court Thursday that some of the charges against him carry the possibility of the death penalty or life in prison, officials said in the briefing later that afternoon.