WikiLeaks creator Julian Assange was arrested in London on Thursday and faces extradition to the U.S. over a charge of conspiracy to commit computer intrusion under the Computer Fraud and Abuse Act. But lawyers not connected to the case said the single count brought by the U.S. District Court for the Eastern District of Virginia isn’t a lock, and connecting communications and interactions will be crucial to proving conspiracy.

The charge, which was originally filed under seal March 6, 2018, alleges Assange and former U.S. Army intelligence analyst Chelsea Manning agreed to hack a password on a government computer. The cracked password, the government alleges, would have allowed Manning to log into government computers under a different username to access documents to share with Assange without the activity being traced to her.