With final exams looming, Rutgers University said Thursday evening it was working with federal and state law enforcement to investigate ongoing attacks on its online systems. The distributed denial-of-service attacks began around 10 a.m. Monday, the second such attack on Rutgers’ systems in less than a month. The attack in late March also lasted several days and shut down access to the university's wireless Internet, e-mail, websites, and online course-management system. “[Rutgers] continues to experience degraded online services,” a university message said. “The DDoS attacks are ongoing and persistent.”