Thai police have detained the wife of a senior officer on suspicion of poisoning nine people with cyanide to death, according to officials. 

The woman, who is in her 30s, was detained on Tuesday in Bangkok in connection with the multiple-year-long killings.

Archayon Kraithong, a spokesperson for the Royal Thai Police, told AFP that investigators think money was the driving force behind the killings. Reporters were informed by Surachate Hakparn, the deputy national police chief, that a 10th victim had survived after throwing up.

"The suspect went to have dinner with (a woman), who threw up but survived. She is also the wife of a policeman," Surachate said. 
 
Police said the woman denies all the allegations against her. "The autopsy has found out that there is cyanide in the bodies," Surachate told reporters. "So it means that the victims have taken the poison by mouth."

Investigators connected the suspect to additional cyanide poisoning cases in the provinces of Kanchanaburi and Nakhon Pathom after questioning her.
 
The woman was initially suspected by police of killing her friend two weeks ago west of Bangkok in the province of Ratchaburi. The victim reportedly passed out on the Mae Klong River bank after releasing fish as part of a Buddhist ritual, according to local media.