NAIROBI, Kenya (AP) — U.S. Secretary of State Antony Blinken in a call with Ethiopia’s prime minister has expressed “grave concern” about the crisis in the embattled Tigray region and urged “immediate, full and unhindered humanitarian access to prevent further loss of life.” Thursday’s call is the latest this week that world leaders have held with Prime Minister Abiy Ahmed as Ethiopia faces growing pressure to open the Tigray region to journalists, independent investigators and far more humanitarian aid. The Tigray conflict, which has entered its fourth month, remains largely in the shadows. Thousands of people have been killed, and starvation is a growing concern.