A father and son are accused of kidnapping two U.S. Forest Service employees and holding them hostage for about 15 hours in Northern California.

Joseph Charles Henrichsen, 49, and his adult son, Phoenix, are charged with kidnapping of a federal employee, officials said. An investigation into motive is underway.

Two US Forest Service workers were doing field work in a northern California forest on Thursday morning when they were abducted at gunpoint, zip-tied and led to a remote trailer,…