"It seems that the driver did it on purpose," said police officer Lars Berglund, who heads the investigation of the incident.
The musicians and the Manager of the band Viola Beach was killed in a car accident on February 13. The group was returning from a rock festival Where's the Music? in Sweden. Machine artists flew off the bridge and fell into the canal from a height of about 25 meters.
The driver's name has not been disclosed. His blood showed no traces of alcohol or drugs.
Viola Beach was formed in 2013 in Warrington. The band has released two singles.