BANGKOK (AP) — A Thai court on Thursday acquitted a Thai woman accused of participating in a 2015 bomb attack on a shrine in Bangkok that killed 20 people and injured 120.

Wanna Suansan was one of three people arrested among 17 suspects who authorities said were responsible for the explosion at Erawan Shrine, a popular tourist destination, especially for visitors from China. The Bangkok Southern Criminal Court ruled that there was insufficient evidence to link her to the attack.

The other two separately judged are ethnic Uyghurs, a Muslim minority in China that has suffered repression. The three were charged with various crimes, including murder, attempted murder and illegal possession of explosive materials.

The two Uyghurs were arrested in 2015 shortly after the August 17 attack. Wanna was later arrested when she voluntarily returned to Thailand from Türkiye in 2017 to turn herself in when she was named a suspect.

Thai authorities have said the attack was revenge by a people-smuggling gang whose activities had been disrupted by police. Thailand cracked down on human traffickers in early 2015 after abandoned camps for Rohingya fleeing persecution in Myanmar and economic migrants from Bangladesh were found in jungles along the Thai-Malaysian border.

However, some analysts suspect that the bombing was the work of Uyghur separatists angry that Thailand had forcibly repatriated dozens of Uyghurs to China in July of that year. Many Uyghurs try to escape persecution and strict control in China with the help of professional smugglers. The shrine’s popularity among Chinese tourists supported the theory that the bombing had a political element.

While the other two suspects, Yusufu Mieraili and Bilal Mohammad, were allegedly linked through video, DNA and other evidence to the attack, the case against Wanna was more circumstantial.

Wanna, 36, was accused of renting accommodation to the alleged attackers. Police said they found gunpowder, fertilizer and other bomb-making materials in an apartment on the outskirts of Bangkok that was rented in Wanna’s name.

The judge said Thursday that there was insufficient evidence to indicate that Wanna had committed the crime with which he was charged.

He said prosecutors could not provide evidence that Wanna was present at the scene of the bombing, had taken the other suspects there or helped them escape. There was also no evidence that she had had contact with them or helped them acquire explosive materials found in the apartment, which she had allegedly rented for the suspects, the judge said.

She said it might have been possible for Wanna to help find accommodation for friends or acquaintances of her husband, who is Turkish, but prosecutors were unable to prove what kind of relationship her husband might have had with the other suspects. Her husband, who is not in custody, is another suspect in the case.

Some of the suspects are Turks, with whom the Uyghurs share ethnic ties.

“Today the court acquitted the charges. I am very happy. I would like to thank the court because I have been waiting for this day for seven years since I came back,” Wanna said after the ruling.

She said that during that time she felt discouraged because “it’s like I didn’t have justice and that also hurt my family.”

Mieraili and Bilal, accused of being the main terrorists, have suffered repeated delays in their trial due to difficulties in finding suitable translators. His attorney, Chuchart Kanpai, said Thursday that his case was still in the witness-examination stage and that his next court hearing is scheduled for March.

The two men pleaded not guilty when their trial began in 2016 and said they suffered mistreatment and torture in prison after their arrests. Police said they believe Mieraili detonated the bomb minutes after Bilal, also known as Adem Karadag, allegedly left a backpack containing the device at the shrine.