Concern about radiation leaks at the Fukushima Daiichi Nuclear Power Station, which suffered damages after an 8.9 earthquake and subsequent tsunami hit Japan Friday, have practically shut down Tokyo’s universities.

Colleges and universities in Japan sent students and professors home over the past few days and wound down to basic functions amid fears of a meltdown at the nuclear plant 160 miles north of the city. The government has also imposed rolling blackouts and asked institutions to restrict their use of power.

Fifteen American students studying in Japan through a Reno-based program are safe and were not in any danger from last week’s historic earthquake, Carmelo Urza, who heads the University Studies Abroad Consortium, said Monday.

For those that remained in Tokyo, many had trouble even making it into work due to irregular train schedules and blackouts affecting traffic lights in bedroom communities outside Tokyo.

At least 2,400 deaths have been reported in the wake of a 9.0 magnitude earthquake and tsunami that devastated Japan on Friday.

The number is expected to rise as officials grapple with the damage, and thousands more are missing or displaced from homes, according to the Associated Press.