Hurricane-battered Puerto Rico is in “deep trouble,” President Donald Trump said Monday night, citing its “broken infrastructure” and “massive debt.”

The series of tweets were his first to address the disaster in the U.S. territory since last Wednesday. The vagueness and tone of his tweets led some critics on social media to question his meaning, suggesting he was blaming Puerto Rico for its current situation, or implying that disaster aid would be tied to debt payments.

Most pointedly, Trump did not offer sympathies to the people of Puerto Rico, nor did he offer specifics about federal aid efforts, which he did recently when hurricanes hit Texas and Florida.

The situation in Puerto Rico remained dire Monday, with much of the island still without electricity and facing shortages of drinking water and fuel. Gov. Ricardo Rosselló said the island was on the brink of a “humanitarian crisis,” according to the New York Times.

Earlier Monday, Rep. Nancy Pelosi, the House Democratic leader, urged Trump to call in the military to help with protection, transportation and search-and-rescue operations in Puerto Rico and the U.S. Virgin Islands.

“This is a crisis,” Florida Sens. Marco Rubio and Bill Nelson said Monday as they traveled to Puerto Rico to assess the damage. “It is important that the federal government stands ready to assist in the difficult days after Hurricane Maria passes, when hope must be available to combat despair,” the pair wrote in a letter to Trump.

There are currently about 10,000 federal emergency workers in the Caribbean, the Federal Emergency Management Agency said, and the U.S. National Guard and Coast Guard are aiding relief efforts.