Three Windward Oahu liquor stores were hit Sunday, leading police to suspect at least the first two of the three robberies may be related.

Shortly after Kainehe Liquor opened Sunday morning, two male suspects wearing hoodies entered and tried to take the cash register.

Police said the register cord got caught, and the suspects fled empty-handed.

The 67-year-old owner did not try to stop the robbery suspects.

That robbery occurred at 7:37 a.m. at 11 Kainehe St. near the entrance to Kailua.

Less than a half hour later at 8 a.m., two masked male suspects entered Angie’s Market at 44-748 Kaneohe Bay Drive in Kaneohe and grabbed the cash register with $300 in it, police said.

Then at 10:14 p.m., three unknown men in their 20s robbed Keolu Market at 1090 Keolu Drive in Enchanted Lake.

Police said the men entered the liquor store and picked up several bottles of alcohol and walked toward the exit.

The owner, a 62-year-old man, tried to stop the men and a struggle ensued.

One of the suspects struck the owner with a bottle. Meanwhile a 53-year-old female employee, pepper sprayed the other two suspects, police said. All three suspects fled before police arrived.

The case is classified as a first-degree robbery.