5 stories to follow: April 22

It's Monday. To help you ease back into the work week, here's your round-up of five stories we're following today:

1. Boston bombings: Many questions remain about the Boston Marathon bombing suspects. The surviving suspect, 19-year-old Dzhokhar Tsarnaev, suffered a gunshot wound to his neck. He is reportedly unable to speak, but is writing responses to questions from investigators. Authorities are also probing whether his older brother, 26-year-old Tamerlan Tsarnaev, had become religiously radicalized in recent years. Charges against the younger Tsarnaev could be filed as early as today.

2. Defense begins at Gosnell trial: The defense will start presenting its case today at the murder trial for West Philadelphia abortion doctor Kermit Gosnell, who could face the death penalty if he is convicted. The prosecution has called its witnesses for the past five weeks.

3. SEPTA worker electrocuted: We'll be watching the condition of a SEPTA employee who was shocked by a live wire overnight and suffered serious injuries.

4. Flight delays over furloughs: Furloughs due to sequestration kicked in Sunday for air traffic controllers, which is leading to modest flight delays. The AP reports that the FAA said flights from Philly and Orlando into various New York airports faced delays due to staffing issues. Flights largely moved smoothly Sunday, but today, as air traffic ramps up, will be a much bigger test.

5. Voter-registration deadline: Today is the last day for Pennsylvania residents to register to vote in time to cast ballots in the May 21 primary.