The Foreign Office have advised Brits to avoid travelling to Sri Lanka unless necessary after attacks killed more than 350 people on Sunday.

Suicide bombers targeted churches during Easter Sunday services, marking the worst bout of violence in the South Asian country since its civil war ended a decade ago.

Read more: Hundreds killed in Sri Lanka explosions

Foreign Secretary Jeremy Hunt has updated the travel advice given to British nationals to urge them to avoid travel unless 'essential'.

Security has been heightened in the area and 40 suspects have so far been arrested over the bombings, including the driver of a van allegedly used by the suicide bombers.

Mr Hunt says the travel advice comes in light of the ongoing security operation and heightened risk of terrorism.

Read more: Easter Sunday Sri Lanka attacks: minister blames local militant group

He said: "Following the horrific attacks on Easter Sunday, and the ongoing Sri Lankan security operation, I have received updated advice from the Foreign Office and decided to update the travel advice to British nationals to Sri Lanka to advise against all but essential travel.

"We will keep this decision under close and constant review. My first priority will always be the security of British citizens living and travelling abroad.

Read more: 40 arrested as day of mourning declared

"We all hope the situation will return to normal very soon, and that the Sri Lankan tourism industry is able to get back on its feet following the terrorist attacks. "

He added: "We will do all we can to help the Sri Lankan authorities."

The Foreign Office have issued the following advice to anyone currently in Sri Lanka:

  • Remain vigilant, keep up to date with developments and follow the advice of local security authorities and hotel security staff;
  • Keep a low profile, avoid crowded public places, large gatherings (including religious gatherings and places of worship) and any demonstrations. All of the attacks on 21 April were carried out either in places of worship or in places where foreign visitors were affected. Any further attacks may be targeted against similar locations;
  • Avoid travelling during periods of curfew (other than to/from the airport - see below);
  • Keep in touch with family and friends, ensuring they are aware of any plans you may have.