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updated 7/27/2010 6:22:31 PM ET 2010-07-27T22:22:31

The mother of an Oregon boy missing for 53 days tearfully addressed her son during a news conference, telling him not to give up hope, while investigators doubled a reward for information in the case.

The Multnomah County Sheriff's Department says "significant progress" is being made in the search for 7-year-old Kyron Horman, but declined to offer details. The $25,000 reward for information leading to the boy's whereabouts has been increased to $50,000.

At a news conference Tuesday, Desiree Young broke down while sharing a message for her son, sobbing: "We are all coming to get you to bring you home."

Kyron vanished June 4 after attending a science fair at his northwest Portland school. The case has taken many twists in the weeks since, many of them centered on his stepmother, Terri Horman.

Police have named no suspects but continue to investigate.

Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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