Three men wearing bandanas over their faces tied up a couple, assaulted them and stole about $4,700 in cash and jewelry during a home invasion robbery in Hacienda Heights on Sunday.

One of the robbers was armed with a knife, said Lt. Arthur Scott of the sheriff’s Industry Station. The woman suffered a small laceration to the lip but wasn’t taken to a hospital, he said. He described the two victims as being in their 60s.

The robbery in the 2000 block of Nadula Drive started at around 7 p.m. The resident arrived home and got accosted by three men in her garage.

Scott said the woman’s husband heard the garage door open, went to help his wife and encountered the suspects. He said the suspects forced the couple into the home then used garments and a belt to tie them up. The robbers put a pillow case over the man’s head, according to the lieutenant.

“(The husband) was sprayed with a window cleaner. He was also kicked and punched,” Scott said.

Scott said the woman sustained the cut to her lip when the suspects slammed her to the floor. After the robbers left, he said the woman wriggled free of her binds and called police.

Scott couldn’t verify media reports that the victims owned or worked in the jewelry business. The suspects were only described as three black men, 25 to 30 and 6 feet tall. They may have used an older model black BMW.

Investigators haven’t yet found a link to other home invasion robberies.

Anyone with information about the case is asked to call the Sheriff’s Industry station at 626-330-3322. Anonymous tipsters can call LA Crime Stoppers at 1-800-222-8477, text “TIPLA” plus the tip to 274637, or use the website http://lacrimestoppers.org