The city police have arrested four persons in connection with the Friday's case in which a cow elephant was killed and another was injured when a speeding truck rammed into them near Mahamaya Flyover.
However, the truck driver, who fled from the spot after the accident, is still at large.
While Zaheer and Iqbal — owners of 40-year-old Rupa and 35-year-old Champa respectively — were arrested on Friday night, Champa's mahout Mukut was arrested on Saturday, police said.
The police have also arrested one Farooq, who is reportedly a middleman.
"We have arrested four people so far. Zaheer and Iqbal were arrested, along with one Farooq who claims to be president of an elephant association. Champa's mahout Mukut was arrested on Saturday," said Shyamakant Tripathi, station house officer of Sector 39 police station. "Rupa's mahout is still admitted in the district hospital," he said.
Meanwhile, Champa, who was injured in the accident, was on Saturday morning taken to Elephant Rescue Centre in Mathura in a dumper for better treatment.
Her condition is said to be stable. Doctors have said that she will have to stay there for over a week.
Champa was escorted by a team of doctors to the centre in Mathura, an official said.
"I spoke to doctors at the elephant centre. They said that her condition was stable. She still has swelling in her injured leg. Doctors may take X-ray of her leg to check if it is fractured," said divisional forest officer B Prabhakar.
Meanwhile, several organisations working for animal protection have approached the Noida police against the owners of the elephants.