American visitors to Dubai and other parts of the UAE have been warned “of heightened tensions in the region” and told to take extra care.

The US Embassy and Consulate General in the Gulf state tweeted: “US citizens are strongly encouraged to maintain a high level of vigilance and practice good situational awareness.”

The warning comes in response to attacks by armed drones on two oil pumping stations in Saudi Arabia. The Houthis in Yemen claimed the attack.

The Department of State is telling Americans in the region: “Both historical and current information suggest that the Islamic State of Iraq and Syria (ISIS), Al Qaeda and affiliated organizations continue to plan attacks against Western targets.

“These attacks may employ a wide variety of tactics, including suicide operations, assassination, kidnapping, hijacking, and bombing.

National Geographic Travel Photo Contest: Week six entries Show all 10 1 /10 National Geographic Travel Photo Contest: Week six entries National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-9.jpg IF YOU TOUCH THE RHINOCEROS, THE LIGHTNING WILL TOUCH YOU. This is my very first-time visit Africa and captures wildlife. There had a group of rhinoceros drank water in a Waterhole at a lighting night. I captured over 10000+ photos to got this shot to show the relationship of nature and wildlife. Which wildlife is a part of the environment, we should not treat them as a tool and we should protect it. Kelvin Yuen National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-4.jpg Oruro Carnival is BoliviaÃ­s most sought after tourist attraction, drawing crowds of up to 400,000 people annually. Whilst the festival is celebrated throughout most of the country, Oruro is without doubt the most popular~ Chen Kyo National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-3.jpg A unique vantage point of both Tower Bridge and Tower of London as they are touched by the 1st morning light. Nara Leite National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-10.jpg migrating wildebeest leap into the river, frantically trying to reach the banks on the other side. many survive the journey, but some are eaten by crocodiles, Penny Hegyi National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-8.jpg During weeks of national days, people living in singapore hang their flag in front of their apartments. Nowadays, more than 80% singapore's population living in apartment built by the government called hdb. This scene captured from the very old hdb built in singapore. Tong Son National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-2.jpg Every morning at the Kumbh Mela in India, pilgrims walk across the Ganges River on temporary pontoon bridges to get to Triveni Sangam. Sangam, for short, is the convergence of the Ganges, the Yamuna, and the mythical river Saraswati. This sacred spot of the river is where the elixir of immortality fell from the Gods and landed. Millions come from all over India to bathe and cleanse their soul in Sangam. Agathe Bernard National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-5.jpg You barely catch a glimpse of the iron Lady for a few seconds, while passing through Bir Hakeim and Passy stations. I don't even remember the number of trips I did between these stations in one hour just for views like these, it was no ordinary journey. In between, I spotted this French man sitting inside, just before boarding and I knew I had a story to tell. Raghav Sethi National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-6.jpg The Nam Pan Market is a 5-day rotating market and the largest market located on Inle Lake. We were lucky enough to be there filming during this. So cool to see the crazy cluster of boats come in and out, felt the perfect timelapse from the drone moment! Toby Harriman National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-7.jpg A flash shot in a Train from Milano to Swiss. Jason Jiang National Geographic Travel Photo Contest: Week six entries nat-geo-travel-6-1.jpg Tawaf is one of the Islamic rituals of pilgrimage. During the Hajj and Umrah, Muslims are to go around the Kaaba seven times, in a counter clockwise direction . During Tawaf pilgrims try to touch and kiss the Black stone of Kaaba also know as Hajar Al Aswad and also pray on the Station of Ibrahim to pray two rak'ahs of nafl prayer. MD Tanveer Rohan

“Rebel groups operating in Yemen have stated an intent to attack neighbouring countries, including the UAE, using missiles and unmanned aerial systems (drones).”

The current UK Foreign Office travel advice for the UAE echoes the concern, saying: “Claims have been made in public media suggesting that there may also be attempts to target missiles and unmanned aerial systems (drones) at the UAE.

“In the event of any incidents, you should monitor local media reports and follow the advice of the local authorities.”

The FCO adds: “Terrorists are likely to try to carry out attacks in the UAE.”