The gulf nation joins a list of countries -- including the U.K., U.S., Canada, Bahrain, Saudi Arabia and Mexico -- that have authorized the emergency use of the Pfizer/BioNTech COVID-19 vaccine.

-ABC News' Christine Theodorou

With Sunday's vaccine shipment now in transit, Pfizer has began preparations to ship out an additional 400 boxes of the vaccine on Monday.

There are 975 vials per box -- each vial provides five doses of the COVID-19 vaccine, the company said.

There are 195 vials per tray and 60,000 vials per freezer.

The first vaccines in the U.S. have now left the Pfizer facility and are on their way to all 50 states.

Two main trucks left on Sunday morning -- an additional truck will come in later to pick up a few boxes and take them to the U.S. territories.

On Monday Pfizer has an order for another 400 boxes of the vaccine as well as an order for a slightly less amount of boxes on Tuesday, the company said.

The first shipments are expected to arrive at 145 sites on Monday, 425 sites on Tuesday and another 66 sites on Wednesday, Gen. Gus Perna of the Trump administration's Operation Warp Speed vaccine program said.

At those sites, the vaccines will be paired with ancillary kits to assist with the vaccinations. The kits contain needles, syringes, alcohol swabs, diluent, safety gear and vaccine reminder cards.

-ABC News' Joshua Hoyos and Luis Martinez

FedEx has begun its shipment process of the Pfizer vaccine in the U.S. on Sunday morning, the company posted on Twitter.

For the first time since the start of the coronavirus pandemic, the United States is reporting an average of nearly 2,200 deaths from the disease per day, according to an ABC News analysis of data collected and published by The COVID Tracking Project.

The national seven-day average of COVID-19 deaths per day day is currently 2,171. That figure has increased by 139% in the past month.

Last week, there were nearly 15,000 fatalities from the disease recorded nationwide, including five days where the daily death toll surpassed the 2,000 mark. That's roughly equivalent to 88 COVID-19 deaths reported each hour.

Meanwhile, the U.S. has reported over 100,000 new cases of COVID-19 every day for more than a month straight, including three consecutive days where the daily count topped 200,000.

Just in the last month, the national seven-day average of daily new cases has doubled, now averaging 191,736 -- the highest it has been since the beginning of the pandemic.

There were 1,018,657 cases recorded nationwide in the first five days of December. To put that in perspective, it took nearly 100 days from the first recorded COVID-19 case in the U.S. for the country to surpass 1 million confirmed cases.

Hospitalizations continue to surge to unprecedented levels, with over 101,000 patients currently hopitalized with COVID-19 across the country -- a new national record.

In the past two months, current hospitalizations have more than tripled, increasing by 223%.

ABC News' Benjamin Bell, Brian Hartman, Kim Soorin and Arielle Mitropoulos contributed to this report.