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A man was arrested after his neighbor caught him on camera crouching next to his front door.

Police believe he may have been attempting to poison a family by injecting chemicals under the front door of their apartment with a syringe. The victim who lives in this apartment complex said this all stems from noise complaints.

Tampa police said footage shows 36-year-old Xuming Li sticking a syringe under the door and injecting a liquid into the apartment.

36-year-old Umar Abdullah lives inside that apartment with his wife and a young daughter.

Abdullah showed how he hid a camera inside a plant facing his front door after becoming suspicious of an odor. "I made a little hole here and I installed the camera," said Abdullah.

Camera catches man injecting chemicals under neighbor's door (CNN Newsource, Bay News 9, Umar Abdullah, Tampa Police Department, CNN)

Abdullah said that for more than a month the chemical smell in their apartment was making his family sick. He also said the symptoms included a headache worse than a migraine, nausea, shortness of breath, drowsiness, and that they began to lose their hair.

"We never expected anyone doing something, a neighbor who we knew by face at least for a year, so we were horrified. We were shaking," said Abdullah.

He said that shortly after his daughter was born his neighbor began making noise complaints.

"If you look at him he's holding his breath. So, he knows the hazardous nature of this chemical," said Abdullah.

He then called the police who sent out the hazmat team to investigate.

According to an arrest affidavit, the hazmat team found methadone and hydrocodone when the liquid was tested.

Li was arrested in June on six charges including aggravated stalking and dispersing a chemical agent.