London attack: The missing faces

Three days on from the London terror attack, and police are yet to formally identify any of the seven people who were killed.

Instead grieving families are making the heart-breaking announcements as they learn the fate of their loved ones.

Thirty-two-year-old James McMullan is the second victim to be named. 

His sister was told his bank card was found on one of the bodies, but she's been unable to formally identify him.

"He was a really good person and he didn't deserve to die… Just loving and caring and no one could ever replace my brother." 

Thirty-year-old Christine Archibald from Canada is also among the dead. 

A family friend said "she had room in her heart for everyone and believed strongly that every person was to be valued and respected."

While some families are grieving, others are panicked and desperate.

Twenty-one-year-old Australian Sara Zelenek hasn't been seen or heard from since the attack. 

She was supposed to be baby-sitting but a last minute change of plan put her in the midst of the terror. 

South Australian woman Kirsty Boden, 28, who has been working as a health professional in the UK, is the latest victim feared dead, Nine News reports.

Australian Prime Minister Malcolm Turnbull says they're greatly concerned about the missing Aussies. 

"There are two other Australians so that brings it to a total of four about whom we have very real concerns."

French chef Sebastien Belanger is also still missing. 

A friend says they've been in touch with the French embassy and police, "and we have about 20 friends looking for him." 

Friends of Xavier Thomas, also from France, and Ignacio Echeverria of Spain are sure to be doing the same. 

As well as the seven killed in the attack, 48 people were injured. Eighteen of them are still in a critical condition.