The 42-year-old suspect arrested after the bomb scare in the Fishponds area of Bristol at the weekend has been bailed.
The 42-year-old was being questioned on suspicion of staging a bomb hoax.
About 600 people had to be evacuated on Saturday morning as bomb disposal experts dealt with a car suspected of containing explosives.
Avon and Somerset police were alerted by a call at about 4am, telling them that the vehicle in Cassell Road had been doused in petrol and something “unsafe” was inside.
The silver BMW did smell strongly of fuel, so an Explosive Ordnance Disposal (EOD) team from the Army's Royal Logistics Corps was called in.
A 200m cordon was set up and 480 homes in Cassell Road and neighbouring Kimberly Road and Grace Road were evacuated.
Residents were eventually allowed to return home at 4pm and several controlled explosions were carried out.
As part of their continuing investigation, detectives are now asking taxi drivers to help them.
Investigating officer DC John Shanahan said: “An examination of the car did not find any trace of explosives, but it had been doused in fuel.
“Our investigation is progressing and we are now appealing for taxi drivers for their assistance.
"We would like to speak to any drivers who either dropped off or picked anyone up in the Blackhorse Road area of Downend/Emersons Green in the early hours of Saturday, or dropped off or picked anyone up in the Cassell Road area in the early hours of Saturday.
“We would also like to speak to any drivers who dropped off or picked anyone up in the City Road area of St Pauls, Bristol, at around 3.50am on Saturday, or dropped off or picked anyone up anywhere in the Bristol area who smelt of petrol, or who may have been carrying a petrol canister.”
DC Shanahan added: “If any taxi drivers think they can help, I would urge them to call South Gloucestershire CID as soon as possible.
“A 42-year-old man arrested on suspicion of a bomb hoax (placing with intent) has been released on bail, while our enquiries continue.”
Anyone with information should call South Gloucestershire CID on 101.