Research indicates reports of a missing swimmer in Evanston, Illinois are unfounded.

EVANSTON, Ill. (CBS) — All beaches in north suburban Evanston were closed to swimmers Monday afternoon as police and firefighters searched the water after receiving reports of a swimmer in difficulty.

But early Monday evening, police said those reports were likely unfounded.

Around 3:15 p.m., Evanston police and firefighters responded to a call of a swimmer lost in the water at Greenwood Street Beach, in the 1100 block of Lake Shore Boulevard.

According to initial information, the swimmer submerged and did not resurface.

All Evanston beaches were closed to swimmers while rescue teams searched the water.

At the time the swimmer was reported missing, conditions on Lake Michigan were relatively calm, with waves only a few feet high.

Divers and boat and jet ski crews could be seen searching the water from 4:50 p.m.

Shortly after 6 p.m., Evanston police said an extensive search was conducted and it was deemed unlikely that a swimmer had gone missing in the water.

Firefighters and police evacuated the area after 6 p.m.