Authorities say two men were attacked Monday evening on the Venetian Causeway in Miami.
Officials with the Miami Police Department said officers responded to a call of a man acting erratically on the causeway around 7:45 p.m.
Police said the man tried to rob a bicyclist and when an older man intervened.
That man was stabbed, according to authorities.
The attacker reportedly fled before officers and paramedics arrived.
Paramedics transported the stabbing victim to Jackson Memorial Hospital. His condition was not disclosed.
Another passerby who came to the victim's aid suffered several cuts. That man was also transported to the hospital. The man initially did not want to go because he had two dogs in his car, but Miami firefighters promised to care for them while he received treatment.
Authorities blocked off a portion of the causeway as officers investigated, causing traffic delays.