US immigration authorities in Texas have detained a prominent Mexican human rights official after he crossed the border following a series of death threats. Gustavo de la Rosa Hickerson is the rights official for Chihuahua state, which includes the border city of Ciudad Juarez. De la Rosa recently reported 170 instances of Mexican soldiers allegedly torturing, abusing and killing innocent people in Chihuahua. US immigration officials say they’re required by law to detain him, since authorities at the border concluded he was seeking asylum. But de la Rosa’s lawyer said his client does not want asylum.