The US on Tuesday urged Yemen's Iran-backed Houthi rebels to stop their offensive on the government-held city of Marib and take part in international efforts to find a political solution.
"The United States urges the Houthis to halt their advance on Marib and cease all military operations and turn to negotiations," the State Department said.
"The Houthis’ assault on Marib is the action of a group not committed to peace or to ending the war afflicting the people of Yemen."
The offensive on Marib city, a stronghold of the internationally recognised government, threatens to complicate a renewed diplomatic push to end the war.
Marib has been a refuge for hundreds of thousands of people fleeing violence during Yemen's six-year war.
US special envoy for Yemen Tim Lenderking said the US was "aggressively" using back channels to communicate with the group.
"We do have ways of getting messages to the Houthis and we are using those channels very aggressively as we're engaging ... in person with the leadership of the key countries involved," Mr Lenderking told a State Department briefing on Tuesday.
The recent push towards Marib by Houthi forces comes alongside intensified drone attacks into Saudi Arabia by the group.
The UN and the new Biden administration have sought to start talks to end the war.
The conflict has created the world's largest humanitarian crisis, the UN has said.
Mr Biden took the first step towards diplomacy by revoking the previous Trump administration's terrorist designation of the Houthis.
Despite removing the terrorist designation from the Houthis, US Secretary of State Antony Blinken said last week that rebel leaders remained under US sanctions.
Mr Blinken said the Biden administration was “actively identifying additional targets for designation, especially those responsible for explosive boat attacks against commercial shipping in the Red Sea” and drone and missile attacks on Saudi Arabia.
The UN special envoy to Yemen, Martin Griffiths, has said the resumption of Houthi hostilities near Marib was extremely concerning at a time of renewed diplomatic momentum.
Yemen's front lines have largely been in stalemate for years but a major Houthi gain in Marib would leave the group in control of what historically was known as North Yemen.
Marib city is also the last line of defence before Yemen's biggest gas and oilfields, which are in government hands.
The UN's International Organisation for Migration says 106,449 people have been displaced by fighting along the Marib front lines over a year.
It said another 385,000 people could be displaced with a major front-line shift. There are 125 displacement sites around Marib, the UN agency says.
WRESTLING HIGHLIGHTS
Profile of Tamatem
Date started: March 2013
Founder: Hussam Hammo
Based: Amman, Jordan
Employees: 55
Funding: $6m
Funders: Wamda Capital, Modern Electronics (part of Al Falaisah Group) and North Base Media
Israel Palestine on Swedish TV 1958-1989
Director: Goran Hugo Olsson
Rating: 5/5
The Bio
Name: Lynn Davison
Profession: History teacher at Al Yasmina Academy, Abu Dhabi
Children: She has one son, Casey, 28
Hometown: Pontefract, West Yorkshire in the UK
Favourite book: The Alchemist by Paulo Coelho
Favourite Author: CJ Sansom
Favourite holiday destination: Bali
Favourite food: A Sunday roast
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MATCH INFO
Uefa Champions League quarter-final, second leg (first-leg score)
Porto (0) v Liverpool (2), Wednesday, 11pm UAE
Match is on BeIN Sports
The specs
Engine: 8.0-litre, quad-turbo 16-cylinder
Transmission: 7-speed auto
0-100kmh 2.3 seconds
0-200kmh 5.5 seconds
0-300kmh 11.6 seconds
Power: 1500hp
Torque: 1600Nm
Price: Dh13,400,000
On sale: now
RESULTS
2pm: Handicap (PA) Dh40,000 (Dirt) 1,200m
Winner: Najem Al Rwasi, Fabrice Veron (jockey), Ahmed Al Shemaili (trainer)
2.30pm: Handicap (PA) Dh40,000 (D) 2,000m
Winner: Fandim, Fernando Jara, Majed Al Jahouri
3pm: Maiden (PA) Dh40,000 (D) 1,700m
Winner: Harbh, Pat Cosgrave, Ahmed Al Mehairbi
3.30pm: Maiden (PA) Dh40,000 (D) 1,700m
Winner: Wakeel W’Rsan, Richard Mullen, Jaci Wickham
4pm: Crown Prince of Sharjah Cup Prestige (PA) Dh200,000 (D) 1,200m
Winner: Jawaal, Fernando Jara, Majed Al Jahouri
4.30pm: Sheikh Ahmed bin Rashid Al Maktoum Cup (TB) Dh200,000 (D) 2,000m
Winner: Tailor’s Row, Royston Ffrench, Salem bin Ghadayer
The specS: 2018 Toyota Camry
Price: base / as tested: Dh91,000 / Dh114,000
Engine: 3.5-litre V6
Gearbox: Eight-speed automatic
Power: 298hp @ 6,600rpm
Torque: 356Nm @ 4,700rpm
Fuel economy, combined: 7.0L / 100km
The specs
Engine: 2.0-litre 4-cyl
Power: 153hp at 6,000rpm
Torque: 200Nm at 4,000rpm
Transmission: 6-speed auto
Price: Dh99,000
On sale: now
The cost of Covid testing around the world
Egypt
Dh514 for citizens; Dh865 for tourists
Information can be found through VFS Global.
Jordan
Dh212
Centres include the Speciality Hospital, which now offers drive-through testing.
Cambodia
Dh478
Travel tests are managed by the Ministry of Health and National Institute of Public Health.
Zanzibar
AED 295
Zanzibar Public Health Emergency Operations Centre, located within the Lumumba Secondary School compound.
Abu Dhabi
Dh85
Abu Dhabi’s Seha has test centres throughout the UAE.
UK
From Dh400
Heathrow Airport now offers drive through and clinic-based testing, starting from Dh400 and up to Dh500 for the PCR test.
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FIXTURES
Saturday
5.30pm: Shabab Al Ahli v Al Wahda
5.30pm: Khorfakkan v Baniyas
8.15pm: Hatta v Ajman
8.15pm: Sharjah v Al Ain
Sunday
5.30pm: Kalba v Al Jazira
5.30pm: Fujairah v Al Dhafra
8.15pm: Al Nasr v Al Wasl
Results
5pm: Maiden (PA) Dh80,000 (Turf) 1,200m, Winner: ES Rubban, Antonio Fresu (jockey), Ibrahim Aseel (trainer)
5.30pm: Handicap (PA) Dh85,000 (T) 1,200m, Winner: Al Mobher, Sczcepan Mazur, Ibrahim Al Hadhrami
6pm: Handicap (PA) Dh80,000 (T) 2,200m, Winner: Jabalini, Tadhg O’Shea, Ibrahim Al Hadhrami
6.30pm: Wathba Stallions Cup (PA) Dh70,000 (T) 2,200m, Winner: AF Abahe, Tadgh O’Shea, Ernst Oertel
7pm: Handicap (PA) Dh85,000 (T) 1,600m, Winner: AF Makerah, Tadhg O’Shea, Ernst Oertel
7.30pm: Maiden (TB) Dh80,000 (T) 1,600m, Winner: Law Of Peace, Tadhg O’Shea, Satish Seemar