Sarah Hekmati, sister of Amir Hekmati, smiles as she arrives at the airport in Frankfurt, Germany, Monday, Jan. 18, 2016, the day after former US marine Amir Hekmati landed safely in Geneva and was transferred to Germany after being released from prison in Iran on Saturday. (AP Photo/Michael Probst)

FRANKFURT, Germany | The sister of former U.S. Marine Amir Hekmati has arrived in Germany to meet him following his release from Iran as part of a prisoner swap.

Hekmati’s sister, Sarah Hekmati, was upbeat as she arrived Monday at Frankfurt airport before heading toward the U.S. military’s Landstuhl Regional Medical Center, where her brother was being treated along with Washington Post reporter Jason Rezaian and pastor Saeed Abedini.

Sarah Hekmati, sister of Amir Hekmati, smiles as she arrives at the airport in Frankfurt, Germany, Monday, Jan. 18, 2016, the day after former US marine Amir Hekmati landed safely in Geneva and was transferred to Germany after being released from prison in Iran on Saturday.  (AP Photo/Michael Probst)
Sarah Hekmati, sister of Amir Hekmati, smiles as she arrives at the airport in Frankfurt, Germany, Monday, Jan. 18, 2016, the day after former US marine Amir Hekmati landed safely in Geneva and was transferred to Germany after being released from prison in Iran on Saturday. (AP Photo/Michael Probst)

“We are looking forward to meeting him, hopefully soon, and we are very excited,” she said as she left the airport with her husband.

“We are waiting to see when they’ll let us.”

The three Americans arrived in Germany late Sunday via Switzerland. A fourth stayed in Iran.

The prisoners were exchanged for pardons or charges dropped against seven Iranians.