CHICAGO – Chicago police say they've been inundated with tips about the death of a 15-year-old girl who had just returned from performing at President Barack Obama's inauguration festivities, but police, activists and ministers are still concerned that someone with valuable information might be holding out.

The reward for information about last week's slaying of Hadiya Pendleton has climbed to $40,000. But people may be afraid to come forward because they don't want to be thrust into a national media spotlight or because they are concerned for their own safety, police, activists and minister said Monday.

Hadiya, a drum majorette, was killed in a park about a mile from Obama's home on Chicago's South Side. Police say the shooter hopped a fence, ran at a group of about a dozen young people and opened fire, killing the girl. No arrests have been made.