Officers went to Gillam Road after a man set fire to something in a garden - a bomb disposal team's assessing the items.
Baby Born In Portsmouth Motorway Police Chase
Tiffany Ellmore from Fareham gave birth on the M275 motorway Friday evening after the police stopped her 100mph dad as he drove her to hospital.
Four unmarked police vehicles surrounded the family car as the baby's head started to appear, in which Tiffany's dad Colin delivered the baby.
The officers present phoned am ambulance which took mother and baby to QA Hospital in Cosham.
Tiffany, who has three other children, was 38-weeks pregnant and had started having contractions around 4pm. Baby Lola Mia Rose weighed a healthy 6lz 4oz and was discharged home on Saturday.
Police said no action would be taken over the M275 drama.
Tens of thousands of people lined the harbour to welcome HMS Queen Elizabeth to her home port for the first time.
Lanes will be added on Junction 9 slip roads, the Parkway South roundabout and Whiteley Way approach.
In a UK first, Hampshire firefighters are teaming up with police in a six-month trial.
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