By Mike Dougherty

PHILADELPHIA (CBS) — An increased reward was set to expire at midnight Sunday for information leading to an arrest in the murder of a woman in Northern Liberties.

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26-year-old Amber Long was shot and killed in a cold-blooded purse snatching right in front of her mother on January 19 (See related story).

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The Fraternal Order of Police upped the ante by doubling the reward from $10,000 to $20,000 for tips before the end of Sunday. However, homicide detectives say there have been no significant developments in the case. They are working on a few minor leads, but tracking down Long’s killer is proving to be a challenge.

Homicide captain James Clark said watching video from the shooting was one of the saddest things he’s ever seen.

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Detectives still hold out hope that somebody knows who shot Long. Anyone with information is asked to call the Homicide Unit at 215-686-3334 or 9-1-1.