Police are investigating a number of unrelated burglaries and robberies in Niagara County – most of them in Niagara Falls, including an armed robbery Wednesday at a 7-Eleven.

A 7-Eleven in the 1500 block of Pine Avenue was hit by an armed robber at 2:30 a.m. Wednesday.

The clerk told police that a man wearing all black clothing, black gloves and a black bandana covering his face threatened the clerk with a small knife. The robber made off with $45, all in dollar bills.

In another case, in the 1100 block of Pierce Avenue in the Falls, a 39-year-old man said that just before 11 p.m. Tuesday, two men jumped him, punched him several times and took $290 from his pocket.

The victim, who was described as intoxicated, had minor scratches and was unable to identify the men, Niagara Falls police reported.

Also in the Falls, at 9 p.m. Monday in the 2000 block of 18th Street, a 27-year-old woman said she was robbed by two women after she left an 18th Street store. The victim, who reported the crime to police on Tuesday, said the two women pushed her and punched her, and fled after taking her bookbag, which contained the narcotic Suboxone, an unknown amount of cash, her driver’s license, Social Security card and other personal papers.

Several burglaries also were reported this week. Among them:

• A 48-year-old 70th Street man told Niagara Falls police Tuesday that a book of First Niagara Bank checks was taken from his house and $600 was withdrawn from his account.

• A Niagara Falls visitor told police that her backpack was stolen Tuesday morning after she accidentally left it behind on the sidewalk while loading items into a taxi. She said she was on the Main Street side of the Comfort Inn when she boarded the taxi to leave for the airport. She said she called police to check the location, but that the backpack was no longer there. The black Kenneth Cole backpack contained a Macbook, Macbook Pro, checkbook and memory stick.

• In the 700 block of 20th Street in Niagara Falls, a woman told police Tuesday night that she allowed a male friend to stay overnight at her residence and she left him alone for several hours. When she returned, her 52-inch television, a laptop and a coffee maker were gone.

• In Gasport, the owner of the Canalside Inn, 4331 Main St., told Niagara County sheriff’s deputies Tuesday that sometime tried to break into the building over the weekend.

• In Wheatfield, a 79-year-old Brookhaven Drive woman told deputies on Wednesday that she was notified by Key Bank that her debit card was used unlawfully in India, with two transactions of $1,065 and $600.