NEW HYDE PARK, N.Y. (CBSNewYork) – The family of a Long Island college student missing near Chicago is offering a $25,000 reward for information in the case.

Northwestern University sophomore Harsha Maddula has been missing since Saturday. The 18-year-old was last seen around 12:30 a.m. following an off-campus party with friends.

WCBS 880’s Sophia Hall reports

On Wednesday, the FBI and local police divers spent the day searching Wilmette Harbor on Lake Michigan where cell phone records show Maddula’s phone was used around 1 a.m. Saturday — the last call signal on his phone.

But the search of the water was not successful and has been called off, according to the school’s website. Instead, police, students, volunteers and Maddula’s family will continue to search on and near the campus.

Maddula is 5-foot-8 and weighs approximately 150 pounds with black hair, dark brown eyes and wearing black-framed glasses.

He was last seen wearing a grey long sleeve sweater with white and black stitching, dark grey pants and brown shoes.

Anyone with information is being asked to call Northwestern University Police at 847-491-3254. For more information, visit