SAN JUAN, Puerto Rico (AP) — Thousands of Puerto Ricans are demanding justice for a university professor arrested after refusing to return her toddler to her ex-husband in the mainland U.S. under a court-ordered agreement.

The custody battle has led supporters to organize a protest Sunday at a woman’s jail along the island’s north coast, where Maha Abdel Rahim is being held until a Jan. 17 extradition hearing.