FILE -In this Wednesday, June 17, 2009, file photo, the Giant panda Lun Lun eats bamboo in her enclosure at the Atlanta Zoo. Zoo Atlanta officials said in a news release Tuesday, July 2, 2013 that 15-year-old Lun Lun will likely deliver a cub in two to three weeks. An ultrasound done Sunday shows the fetus is currently 1.08 centimeters long. Veterinarians based their birth window estimate on a similar ultrasound from Lun Lun's last pregnancy in 2010. (AP Photo/Journal Constitution, Vino Wong, File)

ATLANTA — A spokeswoman for Zoo Atlanta says the zoo’s pregnant giant panda, Lun Lun, has given birth to twins.

Zoo Atlanta spokeswoman Keisha Hines said Monday that officials weren’t immediately sure of the cubs’ genders. Lun Lun went into labor Monday afternoon and gave birth hours later.

An ultrasound on June 30 determined Lun Lun was pregnant with her fourth cub. Zoo officials said they were surprised to see her deliver a fifth cub, and Hines says it’s the first twin panda birth in Zoo Atlanta history.

Officials have said Lun Lun’s cub would be the first giant panda to be born in the U.S. this year.

Lun Lun was artificially inseminated in March and has been under 24-hour observation by a camera providing a live video feed.

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