It also comes barely three months after a Ugandan working for UNICEF was killed by a former security guard in the organization's office the same area. "She is a nurse who was working every day to save lives and improve the health of some of Somalia's most vulnerable people", O'Malley said in a statement.
The 10 remaining worldwide staff are being evacuated to Nairobi until further notice, the ICRC told the BBC.
Armed men have entered the Red Cross compound in Somalia's capital Mogadishu and abducted a German nurse, officials say.
The organisation's staff had earlier told Reuters that the kidnappers snatched their colleague from inside their compound in Mogadishu and took her out through a back door, avoiding security guards stationed at the main entrance. The deadliest ever, a truck bombing last October in Mogadishu, killed more than 500 people. It is one of the world's most unsafe countries for aid workers but abductions remain relatively unusual.
The abduction is the latest in a series of targeted attacks on aid workers in the chaotic Horn of Africa nation.
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Two workers were arguing about a light switch in the breakroom of Terminal E , Philadelphia Police Lt. We have reached out to WFS to assist them in any way possible as they deal with this incident.
A police operation was underway, said local officer Major Mohamed Hussein. "This is a sad reality that we must face".
Somalia, which collapsed into civil war in 1991 and has been wracked by an Al-Qaeda-linked Islamist insurgency since 2006.
The Islamist group, al-Shabab which is fighting to topple the Western-backed government, has been targeting aid workers for political gain, sometimes demanding ransom in order to free the hostages.
Al-Shabab continues to control large parts of rural Somalia despite the efforts of a large multinational African Union force and dozens of USA drone strikes in the past year alone.
The Swiss-based agency, which has provided humanitarian aid in Somalia for years, has temporarily suspended movement in Mogadishu but said Somali staff would continue ICRC's programs outside the capital.