Tensions rose before the Pope's arrival to Seoul, as North Korea launched three short ranged missiles. The missiles landed in the East Sea, also known as the Sea of Japan.
South Korea's Ministry of Defense said that the launch occurred at 9am without any previous warning from the North. The Pope's plane landed at 10:15am. Officials say that they are on the alert for any other potential launches.
The attacks come at a time when the Pope is urging for peace and reconciliation in the peninsula.
During his flight, he sent several messages to the heads of state of the nations he flew over. The most significant of these was a message to Chinese President Xi Jinping . This is the first time that a Pope has flown over Chinese air space.
Many hope that relations between Vatican and China, an ally of North Korea, will improve during his visit to the Korean peninsula.