The first incident occurred at 10.30pm last night (Friday, December 30) when two men waved down a taxi in the Deerhurst Road area of Paulsgrove. The men then asked the driver to pull over in the Blakemere Road area. The men then reportedly threatened the driver with a knife and stole cash and a mobile phone. The men then told the driver to get out of the taxi before driving off in it. The taxi has since been located and recovered for forensic examination.

The second incident occurred at around 11.40pm when two men ordered a taxi to the Tunstall Road area. Once inside the taxi, the men asked the driver to stop in the Hillsley Road area. Both men then threatened the driver with a knife and stole cash and a mobile phone.

The third incident occurred just after 5am this morning (Saturday, December 31). Two men and a woman ordered a taxi from the Tescos store in Port Solent. All three people got into the vehicle. One of the men asked the driver to stop in the Almondsbury Road area. He then threatened the driver with a knife and stole cash and a mobile phone.

None of the drivers were injured.

The men are described as white, between 30 and 45-years-old.

One of the men is described as slim, about 6 feet tall and in his early 40s.

The other man is described as slightly younger with a larger build and is about 5 feet 7 inches tall.

Detective Inspector James Stewart said: “We are carrying out enquiries today to identify these people. We would ask anyone who saw anything suspicious in these areas around these times to contact us and assist us with our investigation.

“Furthermore, we would ask anyone who find any discarded personal items in these areas, like wallets or money bags, to contact us on 101 quoting 44160490153.

“We are working with local taxi companies in the Portsmouth area to ensure drivers feel safe, remain vigilant and report anyone suspicious to us.”