Hundreds of Boston area residents are offering free housing; Megabus is offering travellers free refunds; most flights, rail lines and subway lines are operating.

In the wake of the explosions that killed three people and injured more than 100 others during the Boston Marathon yesterday, it seems most of the city is operating again. If you are visiting Boston, or travelling there in the next few days, here's what you need to know.

A Google document with hundreds of entries has been created by residents in the Boston area offering free housing for those stranded as a result of the bombings. Google has also created a tool called the Person Finder to help people connect with their friends and family. Monday night, local restaurants were opening their doors to those stranded or injured and offered free wireless internet and a “pay only if you can” option. Follow the hash tag #Bostonhelp to find other ways that the local businesses and restaurants are assisting.

A square mile of downtown Boston has been closed off for the investigation, an area that includes Boylston Street between US 20, Highway 2, Commonwealth Avenue and Arlington Street. The Marriott hotel at Copley Place and Lenox Hotel in downtown Boston were evacuated as a precaution but since yesterday the Lenox Hotel has been reopened and is welcoming guests from its entrance on Exeter Street at Huntington Avenue. It’s unclear if the Marriott is open.

According to the Bolt, Megabus and Greyhound websites the carriers are running busses into and out of Boston but are experiencing delays in operations from Boston’s South Station. Megabus riders who wish not to travel today can arrange a free reschedule or refund by calling 1-877-GO2-Mega. Amtrak trains running to and from Boston’s South Station, New York and Philadelphia are also on schedule.

The following alerts and advisories are in effect for Boston’s transit system:

  • Copley Square station, where the blast went off, remains closed with trains bypassing the station. The Green Line D-Branch is experiencing short delays due to a disabled train at Riverside Station.
  • Due to the Copley Square area being closed off to all vehicular traffic, Bus routes 9, 10, 39, 55, 502 and 503 are unable to service Copley Station and the surrounding stations including James Street, Dartmouth Street, Huntington Avenue, Belvidere Street, Dalton Street, Stuart Street and Boylston Street. Routes will begin and terminate at Back Bay Station.
  • All boat service and commuter rail line service is running on schedule, with minimal delays on the Framingham/Worcester, Providence/Stoughton and Newburyport/Rockport rail lines.

Visit the Massachusetts Bay Transit Authority (MBTA) website for more details.

The Federal Aviation Administration (FAA) lifted a brief ground stop in place at Boston Logan International Airport last night, but temporary flight restrictions over part of the city are in effect until further notice. The ground stop impacted flights coming into Logan but did not impact departures. Flights are running smoothly into and out of the airport.

The Boston Public Library’s Central Library in Copley Square is closed. All other branch libraries have resumed normal operating hours. All museums have also resumed normal operating hours. Five colleges – the Benjamin Franklin Institute of Technology, Boston Architectural College, Emerson College, UMass at Boston and Sanford Brown College – will be closed today.

The explosions have put major cities including New York, Washington DC and Los Angeles on high alert, with an increased security presence in airports, bus terminals and on subways and commuter rail lines expected to continue throughout the week. There have been no major delays as a result of the event in other areas nationwide.

Follow the FAA on Twitter for updated flight information and the MBTA for updated commuter rail, subway and bus schedules. Follow the Boston Police Department for updated public safety announcements.

To learn more about the safety measures you can take at home, at work, in school or in public in the event of a bombing, visit the National Terror Alert Response Center.