A man was arrested on suspicion of arson with intent to endanger life after a caravan fire forced neighbours to flee their nearby homes.
Four people were assessed by medics after the blaze, which took hold in the early hours of Friday morning.
Detectives have since questioned a 35-year-old man over the incident.
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Emergency services were called to Kingsland Road in Norris Green at around 1.30am.
Merseyside Fire and Rescue Service dispatched four engines to the scene. The organisation said firefighters "found a caravan well alight on the driveway of a two storey property".
The fire spread to two homes, both of which had been evacuated after those inside were alerted to the flames closing in on their addresses. It took more than two hours for crews to deal with the blaze.
Of those who were checked over by North West Ambulance Service staff, one had suffered slight smoke inhalation but none needed hospital treatment.
Merseyside Police also attended the scene and, following inquiries, arrested a man from the Orrell Park area on suspicion of arson with intent to endanger life. He has been released on conditional bail pending further enquiries.
*Anyone who witnessed the incident or has any information is asked to contact the force online via Twitter (@MerPolCC) or Facebook (Merseyside Police Contact Centre) or by calling 101 and quoting the crime reference number 21000425602.
Crimestoppers can be contacted, anonymously, on 0800 555 111 or online here.
