(CNN) St. Louis Mayor Lyda Krewson has announced $25,000 rewards for information leading to arrests of the people who killed four children in a rash of shootings this summer.

Five children aged 10 and under have been shot and killed since April and Krewson asked anyone with information to come forward because "conventional policing tactics are not enough."

"We are all at risk when these suspects remain out on the street," she said.

The announcement came a day after Jurnee Thompson, 8, was shot and killed while with family outside a restaurant near Soldan High School on Friday night.

On April 30, 2-year-old Kayden Johnson and his mother were fatally shot in their home. On June 9, 3-year-old Kennedi Powell was shot as she stood on the sidewalk in front of her home with family. And on July 19, 10-year-old Eddie Hill was shot as he stood on the porch of his home with family. No arrests have been made in these four cases.

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