Authorities in Gibraltar say an operation to pump fuel out of a stricken gas tanker is under way after it began leaking oil into the sea.
The OS 35 developed a serious leak after it collided with another vessel off the southern tip of the Iberian Peninsula on Monday.
Divers have since sealed the source of the leak but the environmental impact and the quantity of oil spilt were not immediately clear.
Chief Minister of Gibraltar Fabian Picardo told Spanish media earlier on Thursday that the operation to remove about 500 tonnes of fuel from the ship’s tanks should take roughly 50 hours using the ship’s own pumps.
Officials said early on Friday that 80 per cent of the diesel on the ship had been removed but that about 180 tonnes of heavy fuel is still on board.
The spokesman, who was not authorised to be named publicly, said the ship had been carrying 250 tonnes of diesel, and still had 183 tonnes of heavy fuel oil and 27 tonnes of lubricant oil in its tanks.
The heavy fuel oil is potentially more damaging to the environment and more difficult to extract, raising concerns in Spain and Gibraltar over local marine life and tourism.
The usually busy port of Gibraltar remains closed, but the neighbouring Algeciras port in Spain is fully operational.

Mayor of nearby La Linea de la Concepcion, Juan Franco, said fuel from the leak had been pushed by winds and currents towards a nearby beach.
“What has entered is a worrying spillage but it is not a tragedy,” Mr Franco said. He said the most important issue was to remove the remaining fuel oil on the tanker safely.
The collision happened when the OS 35 was attempting to exit the bay.
Bulk carriers are vessels dedicated to transporting solid goods, such as grain, and the fuel on board is that used by the ship itself.
The liquefied natural gas tanker suffered no significant damage.
Gibraltar's busy port has been mostly closed since the accident.
The territory, measuring only 6.8 square kilometres, overlooks the only entrance to the Mediterranean from the Atlantic Ocean, putting it on the shipping route to the Middle East via the Suez Canal.
Tomorrow 2021
Day 1 results:
Open Men (bonus points in brackets)
New Zealand 125 (1) beat UAE 111 (3)
India 111 (4) beat Singapore 75 (0)
South Africa 66 (2) beat Sri Lanka 57 (2)
Australia 126 (4) beat Malaysia -16 (0)
Open Women
New Zealand 64 (2) beat South Africa 57 (2)
England 69 (3) beat UAE 63 (1)
Australia 124 (4) beat UAE 23 (0)
New Zealand 74 (2) beat England 55 (2)
Mohammed bin Zayed Majlis
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4.35pm: Tilal Al Khalediah
5.10pm: Continous
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6.20pm: West Acre
7pm: Flood Zone
7.40pm: Straight No Chaser
8.15pm: Romantic Warrior
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Plastic tipping point
THREE POSSIBLE REPLACEMENTS
Khalfan Mubarak
The Al Jazira playmaker has for some time been tipped for stardom within UAE football, with Quique Sanchez Flores, his former manager at Al Ahli, once labelling him a “genius”. He was only 17. Now 23, Mubarak has developed into a crafty supplier of chances, evidenced by his seven assists in six league matches this season. Still to display his class at international level, though.
Rayan Yaslam
The Al Ain attacking midfielder has become a regular starter for his club in the past 15 months. Yaslam, 23, is a tidy and intelligent player, technically proficient with an eye for opening up defences. Developed while alongside Abdulrahman in the Al Ain first-team and has progressed well since manager Zoran Mamic’s arrival. However, made his UAE debut only last December.
Ismail Matar
The Al Wahda forward is revered by teammates and a key contributor to the squad. At 35, his best days are behind him, but Matar is incredibly experienced and an example to his colleagues. His ability to cope with tournament football is a concern, though, despite Matar beginning the season well. Not a like-for-like replacement, although the system could be adjusted to suit.
Tickets
Tickets for the 2019 Asian Cup are available online, via www.asiancup2019.com
KILLING OF QASSEM SULEIMANI
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Company profile
Company name: Nestrom
Started: 2017
Co-founders: Yousef Wadi, Kanaan Manasrah and Shadi Shalabi
Based: Jordan
Sector: Technology
Initial investment: Close to $100,000
Investors: Propeller, 500 Startups, Wamda Capital, Agrimatico, Techstars and some angel investors
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Towering concerns
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