According to Giacoppo, most of the victims had not seen their assailant face-to-face and were “reluctant” to make a positive identification.

He said police may be able to make an arrest if more evidence surfaces.

City Manager Robert W. Healy said that with the arrest of Ramos and the questioning of the second suspect, police believed there would not be further incidents.

Galluccio praised the joint work of CPD and HUPD.

“I think it’s good for us and the residents of the city to know we have cooperative expertise to solve these issues,” he said.

Councillor Marjorie C. Decker said she had noticed a “visible increase” in police patrols of the Harvard Square area since the crime wave. She also praised the increased use of escort services on the campus.

Councillor Brian P. Murphy ’86-’87 also asked the city to look into safety issues on Cambridge Common. He proposed organizing a public walk through the park for police, city officials and residents to discuss specific concerns, and Healy indicated support for the idea.

—Staff writer Michael M. Grynbaum can be reached at grynbaum@fas.harvard.edu.

—Staff writer Jessica R. Rubin-Wills can be reached at rubinwil@fas.harvard.edu.