One woman is seen lying on a blood-soaked walkway as someone presses a towel to her back.
A security officer was also hurt while trying to arrest the attacker, and all five victims have now been taken to hospital via ambulance.
Three Spanish tourists have been stabbed along with a security person near the Roman ruins in Jerash, Jordan, state newspaper al-Rai reported citing security sources.
Details on their conditions were not immediately known, but two people reportedly in critical condition were airlifted to a hospital in the capital, Amman, by helicopter.
In one video, a woman can be heard screaming in Spanish.
Sources at the Public Security Department said that the suspect has been identified and arrested. 'It's a dagger, it's a dagger, there is a knife.
Those attacks ended after four gunmen were shot and killed by Jordanian security forces during a standoff at Karak Castle, a Crusader fortress and popular tourist destination. Another man sits nearby with an apparent leg wound. Please, help him now!'
At this stage the motive for the attack in unknown.
Jerash is famed for its Roman ruins.
Jordan has seen a surge in tourism in the last two years and is considered by tour operators as one of the safest tourist destinations in the Middle East.
Jordan welcomed seven million tourists in 2010, but arrivals plunged to around three million in each of the following two years, tourism board head Abed Al Razzaq Arabiyat said in April.