JACKSONVILLE, Fla. -

The Jacksonville Sheriff's Office said it is investigating two robberies to two Kangaroo gas stations on consecutive days.

In each case, a man robbed a gas station with a knife and had his face and/or head covered by a blue cloth or scarf, police said. They said despite these similarities, investigators are still working to determine if the robberies are related.

On Wednesday, a man went into the Kangaroo gas station at 3051 Monument Road as the clerk was sweeping the store, police said. They said the man displayed a knife and demanded money, and once he had the cash, he fled east on foot.

The robber was described as a black man between the ages of 25 and 30, 5 feet 8 inches tall and 160 pounds. He was wearing a gray hooded sweatshirt, jeans and a blue bandanna or cloth over his face.

On Thursday, a man went into the Kangaroo store at 11985 Beach Blvd. and approached the clerk with his face covered, police said. They said the man pulled out a knife and grabbed the clerk, then obtained cash and fled the store.

The robber was described as a black man, 5 feet 8 inches tall and between 155 and 165 pounds. He was wearing a dark jacket, blue cloth covering his face, black pants and black gloves.

Anyone who has any information about either of these robberies is asked to call the Jacksonville Sheriff's Office at 904-630-0500 or Crime Stoppers at 866-845-TIPS.