Foreign Office issues terror advice to Britons in US
The Foreign Office has warned British citizens in the US to remain vigilant ahead of the 10th anniversary of the 9/11 attacks on Sunday.
Stateside officials have warned of a "specific, credible threat", possibly targeting New York or Washington DC.
"Attacks could be indiscriminate, including in places frequented by expatriates and foreign travellers," said the Foreign Office.
However, the updated advice did not warn against visiting specific areas.
The full Foreign Office advice says: "There is a general threat from terrorism in the United States. Attacks could be indiscriminate, including in places frequented by expatriates and foreign travellers.
"In light of the publicity surrounding the anniversary of the 9/11 attacks, we remind British nationals of the global threat of terrorism and need to remain vigilant."
Speaking on Thursday, New York Mayor Michael Bloomberg said the threat was "uncorroborated", but security would be boosted at bridges, tunnels and on public transport.
Police Commissioner Raymond Kelly added that spot checks in the New York subway would be more frequent in coming days.
Meanwhile, British officials said there has been no change to the threat level in the UK, which was reduced from "severe" to "substantial" in July, meaning an attack is considered a "strong possibility".