A foreign monitoring group reported that Cuba's internet service shut down for the second time in two days, saying it appeared to be unrelated to problems from the storm but rather an attempt to keep information about the demonstrations from spreading.
A powerful explosion due to a suspected gas leak ripped through a luxury hotel in central Havana, Cuba, on Friday.
The latest death toll of 22, which includes at least one child, was announced on television news after a day in which ambulances ferried the injured to hospital and paramedics treated those with less severe ailments on the spot.
The victim, who was not identified, had to receive medical attention, CNN reported, citing unnamed sources.
Even superpowers must learn to live with regimes they dislike.
Obama arrived in Cuba on Sunday on a trip that comes 15 months after he and Castro agreed to end five decades of Cold War-era animosity and work to normalize relations.
Three years after being feted by star-struck Latin American leaders, U.S. President Barack Obama faces skepticism and disappointment at this week's Summit of the Americas for failing to meet promises of a new era in relations with the region.