A teenager arrested in Barking in connection with the London Bridge terror attack is to remain in police custody after a warrant for further detention was granted.

The 19-year-old, who was arrested on Sunday, can now be questioned by police until Sunday evening.

He is one of six men to remain in custody in connection with the incident on Saturday, June 5, in which eight people were killed.

A 28-year-old who was arrested in the early hours of Saturday in Barking is currently detained at a Berkshire police station under the terrorism act. Searches of the home where he was arrested at are ongoing.

A 29-year-old arrested in Newham and a 27-year-old arrested in Ilford on Friday, June 9, both on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism under Section 41 of the Terrorism Act 2000, remain in custody.

Two men, aged 27 and 29, who were arrested in Ilford on Monday, June 5 are also being held under terrorism legislation.

Fourteen other people arrested as part of the investigation have been released without charge.

One man, aged 33, was arrested on a street in Ilford on 8 June on suspicion of possession with intent to supply controlled drugs, and further arrested on suspicion of firearms offences, has been bailed to a date in late June.

Meanwhile, officers have established that the three pink knives used by the terrorists – Khuram Butt, 27, and Rachid Redouane, 30, from Barking, and Youssef Zaghba, 22, believed to be from Ilford – were bought from a specific shop in east London.

The three used a van hired in Harold Hill to mow down pedestrians on London Bridge before stabbing people in Borough Market.

Among their victims were Xavier Thomas, 35, from France, whose body was recovered near Limehouse after being knocked into the Thames, and Spanish-born Canary Wharf banker Ignacio Echeverria Miralles de Imperial, 39, who lived in Poplar.

James McMullan, 32, from Hackney, was also killed, as were Frenchmen Sebastien Belanger, 36, and Alexandre Pigeard, 26.

Canadian Christine Archibald, 30, died in her fiance’s arms, while two Australian victims have been named as nurse Kirsty Boden, 28, and Sara Zelenak, 21.