Two Australians have died in the London terror attacks, Federal Government confirms.

A second Australian has been confirmed dead following the London Bridge terror attack.

Foreign Minister Julie Bishop made the announcement in a statement on Wednesday, saying the government was deeply saddened by the deaths.

Read the full statement from Foreign Min Julie Bishop on news just in, that two Australians were killed in the London attack @7NewsSydney pic.twitter.com/wctMHpSjQ3

— Freya Cole (@freya_cole) June 6, 2017

“The Australian government is deeply saddened to confirm that two Australians have been killed in the London terrorist attack,” the statement reads.

“We continue to work with the United Kingdom authorities who have asked that we await official confirmation of the identities of the victims, and for the families to be officially notified, before we release their names.

Yesterday, the family of one of the two Australians – nurse Kirsty Boden, 28, from South Australia – confirmed her death.

The 28-year-old nurse had been living in the British capital for some time and was among seven people who died in the attack on London Bridge and nearby Borough Market early on Sunday (AEST).

"As she ran towards danger, in an effort to help people on the bridge, Kirsty sadly lost her life," the family said in a statement issued through London's Metropolitan Police on Tuesday.

"We are so proud of Kirsty's brave actions which demonstrate how selfless, caring and heroic she was, not only on that night, but throughout all of her life. Kirsty – we love you and we will miss you dearly."

It was unclear if Ms Boden was hurt when terrorists used a van to run down pedestrians on the bridge or when they went on a stabbing rampage in a nearby market.

It has been reported she may have been attempting to assist another person.

"Kirsty was loved and adored by her family, friends and boyfriend," the family statement read.

"She was the most outgoing, kind and generous person who loved to help people. Helping people was what she loved to do in her job as a nurse and in her daily life."

A 21-year-old Brisbane woman has been missing since Saturday's attacks in London, with her family and friends launching an appeal on social media to find her.

Sara Zelenak was last seen on London Bridge on Saturday night, when she became separated from her friends.

No one has seen or heard from the young au pair since a van ploughed into a crowd and men began stabbing innocents at Borough Market.