article_snippet.sent: New York City's mayor says three of the four people critically injured in the fire and explosion have been released from the hospital.
article_snippet.sent: Mayor Bill de Blasio said at a news conference Monday that the remaining patient was in Bellevue Hospital and 'doing well.'
article_snippet.sent: Mayor Bill de Blasio said fire marshals, the NYPD and the district attorney's office were investigating the cause of Thursday's apparent gas explosion.
article_snippet.sent: Mayor Bill de Blasio said Mayor Bill de Blasio hasn't ruled out policy changes, or tougher penalties for those caught tampering with gas, but the investigation must conclude that first.
article_snippet.sent: New York City's mayor says most residents in the surrounding area who were evacuated immediately after the blast have returned to most residents in the surrounding area who were evacuated immediately after the blast have returned to their homes homes.
article_snippet.sent: Mayor Bill de Blasio had turned to putting up posters and appealing for help on social media after not seeing New York City's mayor two beloved cats since last Thursday's gas explosion .