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Authorities briefly shut down the entrance to the Rosslyn Metro station Thursday evening after one sick child vomited on platform, which prompted a large crowd of young people to run out of the station, officials said.

The incident happened just after 9 p.m. when about 200 or more youths entered the station in Arlington, said Dan Stessel, a Metro spokesman. One of the juveniles became ill, and immediately other children reacted, running from the station.

The rush of youths from the station forced authorities to respond, and they briefly shut down the entrances for about 10 minutes as they investigated, Stessel said. Nothing hazardous was found and the station reopened.

Rail service was not affected.

Flash flood warnings and watches in Northern Virginia expired at 6 a.m. Wednesday, but the National Weather Service has issued a flood warning for the area until 10 a.m.

Small streams in Manassas, Manassas Park and throughout Prince William County are at risk, reports the weather service.

The warning is a continuation of alerts that began earlier this week as heavy rains fell across the region. Prince William County was especially hard-hit, with numerous road closures and flooding problems.

On Tuesday, two fatalities on I-95 were blamed on wet roadways, and residences in Manassas were evacuated after high water was reported in Lake Jackson. Washouts were reported on rural road,s and school bus service was canceled at three schools in the county.

Showers and thunderstorms are expected to continue Wednesday into the evening.

Stay with Capital Weather Gang for the latest forecast and Dr. Gridlock for road conditions.

This story has been updated.

Inova Mount Vernon Hospital lost power periodically over the weekend and for most of Monday due to equipment failures, hospital and power company officials said, although the hospital used generators to handle acute and emergency care.

A spokeswoman for Dominion Virginia Power said the outage was caused by the replacement of a piece of hospital power equipment that triggered a failure of power company transformers. Dominion crews worked with hospital officials from Saturday morning through Monday to fix the problems. Power was fully restored Monday at 6:45 p.m.

Elective surgeries were postponed, said Tony Raker, spokesman for Inova Helath Systems, but no acute or emergency patients were affected.

Brayan Juarez, Ricardo Juarez and Marco Limus protest Carlos Slim’s reception of an honorary degree from George Washington University on Sunday morning. (Hamil R. Harris - The Washington Post)

The George Washington University’s graduation on the Mall was peaceful Sunday morning, with a modest protest against a billionaire honorary degree recipient barely impacting the ceremony.

Not a cloud was in the sky nor a protester could be heard as approximately 7,000 students received their degrees. As 25,000 people gathered for the event, hundreds of people protesting Mexican telecommunications giant Carlos Slim stood nearby on the grounds of the Washington Monument but did little to disrupt his speech.

As Slim stood to receive an honorary doctorate of Public Service, a chorus of horns erupted. Slim didn’t miss a beat, delivering his speech in soft tones.

“When you give, do not expect to receive,” Slim said. “God forgives our sins, but not our services.”

Maryland health officials issued a warning to consumers Thursday, advising them not to eat any fresh or frozen molluscan shellfish that come from South Korea because they are considered potentially unsafe for consumption.

(Bill O'Leary - The Washington Post) Crabs and shrimp are not considered molluscan shellfish.

Shellfish grown and produced in Maryland are not affected.

The affected Korean shellfish includes fresh or frozen oysters, clams, mussels, and whole and roe-on scallops, either shucked or in the shell, whole or in part. This includes frozen breaded shellfish products from South Korea.

Health officials said there are no recent cases of illness in Maryland known to be related to Korean shellfish.