The brazen attack, captured on video, recalled the political violence of past decades. The senator arrived at a hospital in critical condition.

Colombian Senator Miguel Uribe, a potential presidential contender, remains in critical condition and has shown little response to treatment after being shot in Bogota, the hospital treating him said on Monday.

The attack against a conservative senator, Miguel Uribe Turbay, has shaken a nation that has struggled to move past its long history of political violence.