It came as Malaysia Airlines offered customers the chance to cancel flights to London, and countries issued advisory notices to their citizens holidaying in the capital.
On Monday morning the name of the first victim was released. Canadian Chrissy Archibald, who was from British Columbia, died in the arms of her fiancé on London Bridge.
London Bridge and Borough Market were beginning to reopen on Monday, after being closed on Sunday while police conducted their investigation, although many offices nearby stayed closed including Abta’s headquarters.
In a statement the association said: “Our thoughts are with everyone affected by the terrorist attack in London on the evening of Saturday 3 June.
“The police are carrying out ongoing investigations in the vicinity of Abta’s London Bridge office. The Abta office is within the police cordon and at this time we cannot access it. It will therefore remain closed during Monday, 5 June 2017.
“The Abta team will have limited access to phone lines, so if you do need help or advice about your holiday please go to our Customer Support Hub on abta.com.”
The association added that it hoped to be able to access its office as normal on Tuesday, June 6.
Elsewhere, Malaysia Airlines said in a statement: “Any customer wishing to cancel their London flight on 3, 4 or 5 June can get a full refund. Customers who wish to reschedule their London flights from 3, 4 or 5 June can do so with no penalty or extra payments.”
https://twitter.com/MAS/status/871253552902975488
Short-break specialist Super break said it was monitoring the situation and was offering free amendments or cancellations to agents who have customers travelling to London today (Monday June 5) and Tuesday. The same offer applied on Sunday.
Meanwhile countries warned their nationals travelling to the UK to be vigilant.
Japan’s foreign ministry said citizens should avoid potential terror targets in London such as sightseeing spots, department stores, markets, concert venues and political rallies.
The US Department of State Bureau of Consular Affairs tweeted to advise citizens in the capital to avoid London Bridge and Borough Market areas.
However president Donald Trump sparked controversy when he used the incident to call for his travel ban on visitors from six predominantly Muslim countries to be upheld by US courts.
https://twitter.com/realDonaldTrump/status/871143765473406976
Trump also criticised mayor of London Sadiq Khan, accusing him in a tweet of downplaying the attack by telling Londoners that there was “no reason to be alarmed”.
https://twitter.com/realDonaldTrump/status/871328428963901440
The post angered many in the UK, who highlighted that Khan had been referring to increased police numbers on the street.
Khan’s team said he had “more important things to do than respond to Mr Trump”, who had “deliberately” taken his remarks "out of context", the BBC reported.
Elsewhere travel industry figures took to Twitter to post their support for the capital.
https://twitter.com/jlo_said/status/871265432459763713
https://twitter.com/Degsycom/status/871406882900127744
https://twitter.com/richardbranson/status/871160676785561600
https://twitter.com/richardbranson/status/871540649945956352