LISA LEFF, Associated Press OAKLAND, Calif. (AP) — The San Francisco Bay Area's main commuter train system and its unions reached a tentative agreement on a new contract Monday night, ending a crippling four-day strike. Union officials announced the deal, which still requires approval from union members, then from the Bay Area Rapid Transit's board of directors. BART spokeswoman Alicia Trost said limited service would begin Tuesday at 4 a.m. on all lines. BART officials hoped trains would be running at full strength in time for the afternoon commute. BART is the nation's fifth-largest rail system, with an average weekday ridership of 400,000. Workers walked off the job on Friday after talks broke down. Commuters endured jammed roadways and long lines for buses and ferries, as they looked for alternate ways around the region.

SCOTT SONNER, Associated Press SPARKS, Nev. (AP) — shooting at a middle school in northern Nevada has left two people dead and two boys in critical condition, rattling parents, teachers and students as they showed up for the start of the school week. The identities of the shooter and victims weren't immediately known. The suspect is "down," police said, and school officials say there is no further danger. The first reports of the shooting came in at about 7:15 a.m., about 15 minutes before the first classes were set to begin. Students from the middle school and next door elementary school were evacuated to the nearby high school, and classes were canceled.

JULIE PACE, AP White House Correspondent WASHINGTON (AP) — President Barack Obama is expected to acknowledge that widespread problems with his health care law's rollout are unacceptable, as the administration scrambles to fix the cascade of computer issues. Obama was scheduled to speak Monday from the Rose Garden, his first health care-focused event since the scope of the problems became apparent. The troublesome rollout of the health care exchanges has been a glaring embarrassment for Obama's signature legislative achievement. White House officials say the president will discuss steps the administration is taking to address the failures, including ramping up staffing at call centers where people can apply for insurance by phone.