That account corresponded with one provided by the Britain-based Syrian Observatory for Human Rights, which said foreign fighters had abducted the bishops near a checkpoint outside Aleppo. Director Rami Abdul-Rahman said activists in the area said the gunmen were foreign fighters from the Caucuses.
However, the main opposition group, the Syrian National Coalition, condemned the kidnapping and blamed Assad's regime.
In Rome, Pope Francis called for the rapid release of the two bishops. In his appeal Tuesday, the pontiff called the abduction "a dramatic confirmation of the tragic situation in which the Syrian population and its Christian community are living."
There has been a spike in kidnappings in northern Syria, much of which is controlled by the rebels, and around Damascus in recent months. Residents blame criminal groups that have ties to both the regime and the rebels for the abductions of wealthy residents traveling to Syria from neighboring Turkey and Lebanon.