Authorities found, police said, that “several trees there were overgrown,” allowing robbers to hide and attack victims jogging or walking by.
Police said Friday that the city has trimmed the trees to eliminate the hiding places. Police also said they had stepped up patrols.
In the most recent incident, police said, five robbers confronted the jogger and, after punching him, one took a cellphone.
The Aug. 11 incident involved four robbers, one with a knife, who surrounded the victim. They took a phone and $30, police said.