A fourth retail store in the North Shore was targeted by an armed offender Friday afternoon, Winnetka police announced Saturday morning.

A man entered a shop in Hubbard Woods at about 1:30 p.m. with a knife and demanded cash from the clerk before leaving the store, according to police. Police declined to name the store, citing the pending investigation.

Police also declined to say how much money the offender took from the store.

Related: Glenview Store Robbed, Two Other Nearby Stores Targeted

This is the fourth armed robbery attempt by a man matching a similar description in the area in three days. Northfield, Glenview and Wilmette were all hit with retail robbery earlier this week, according to area police.

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The spree began Wednesday morning around 10:50 a.m. at Yellow Bird Stationery store in the Plaza Del Lago shopping center. A second incident at Claire’s, 2301 Town Center in Glenview, happened just after the store opened at 10 a.m. Thursday, police said. Just 35 minutes after the attempted robbery in Glenview, an employee at Rocky Mountain Chocolate Factory in Northfield was threatened at knife point.

Police describe the offender as a white male in his late teens or early 20s, wearing a red-hooded sweatshirt with "LIFE GUARD" in white letters, khaki shorts and flip flops. In addition, police said he is between 5 feet, 9 inches tall and 5 feet, 10 inches tall, with a slender build, a brown medium length buzz haircut and large, dark round-lens tortoise shell sunglasses.

Winnetka police ask that anyone with information please contact police at 847-501-6034.