SCHAUMBURG (CBS) — Schaumburg Police have new tips to follow up in the hit-and-run death of high school track star Mikias Tibebu.

Schaumburg Police Sgt. John Nebl cannot say for certain what has prompted the additional tips, the emotional funeral and memorial service, the Thursday news conference or the increase in the reward to $11,000 for information leading to an arrest and conviction.

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But he said police are following everything they receive.

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“We have tips which is good but I mean we can’t say that we have made progress yet until one of them starts to look promising and even then we probably wouldn’t even say we have a promising tip until we are pretty darn sure.”

Nebl said a review of security tapes from cameras mounted along Schaumburg Road continues, but police have not narrowed down the possible vehicles to the point where they can give a description.

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Police have said that Tibebu was laid out flat on the road, and say the motorist may not have realized he had hit a person.

The injuries found in the autopsy indicated that Tibebu was not car surfing before the accident, as some Web sites had speculated.

Toxicology reports are pending, and will not be completed for a couple of weeks, but Nebl said nothing has turned up in questioning of friends and others who were with Tibebu in the hours before his death to indicate that he had been using alcohol or drugs.

Tibebu was hit at approximately 12:30 a.m. Dec. 8, five minutes after leaving three friends who were with him in a subdivision near Branchwood Drive and Schaumburg Road.

Police continue to urge anyone who has information, no matter how insignificant it may seem, to call them.

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Schaumburg Police can be reached at (847) 882-3534.