Five people were arrested after an explosion, the third in less than a week, that occurred near the Golden Temple, a holy site for Sikhs, in the northern Indian city of Amritsar, police reported on Thursday.
Two of the suspects designed the improvised explosive devices at a guesthouse in the city and the other three provided the materials, State Police Director-General Gaurav Yadav said at a news conference.
He did not provide any information on the alleged motives of the attackers, but added that the investigation is still ongoing.
According to the authorities, the low-intensity explosion occurred around midnight local time (18:30 GMT) on Wednesday night.
No injuries were reported, police said.
“The area is completely cordoned off and a forensic (police) team is working there,” said Naunihal Singh, a police officer.
Two earlier explosions, which occurred Saturday night and then Monday morning, injured one person each.
Built in a huge artificial pond, the Golden Temple is revered by Sikhs around the world.
But it has been the scene of violence on several occasions, notably when Indian Special Forces stormed it in 1984 to evict the Sikh fighters who were occupying it.
In late April, Punjab authorities arrested Amritpal Singh, a Sikh separatist preacher, in the north of the state after thousands of agents had hunted him down for a month.
The 30-year-old Sikh has come to prominence in recent months by calling for the creation of Khalistan, a state claimed by Punjab Sikh separatists, whose fighting in the 1980s and 1990s sparked violence that left thousands dead .
It is unclear if these recent outbursts are related to his arrest.