The U.S. Department of Homeland Security confirmed that the suspect was admitted to the United States after presenting a passport displaying an F43 family immigrant visa in 2011. The suspect is a Lawful Permanent Resident from Bangladesh who benefited from extended family chain migration.
Immediately after the incident, White House spokeswoman Sarah Sanders tweeted that the president of the United States had been briefed on the explosion.
"This attack underscores the need for Congress to work with the president on immigration reforms that enhance our national security and public safety," she told reporters in an afternoon news briefing.
Sanders added that the country "must move to a merit-based system of immigration."
Meanwhile, U.S. President Donald Trump, who usually likes to tweet when anything important happens, has not mentioned the explosion on his twitter account.
The latest tweet he has is one that says New York Times' story about him watching four to eight hours of television a day was false.
Analysts at the SITE Intelligence Group noted that the pro-Islamic State Maqdisi media group suggested a link between the attack and President Trump's decision last week to recognize Jerusalem as the capital of Israel, The Washington Post reported.
Other media reports said Ullah might have carried out the attack due to Israel's military strikes in Gaza at the weekend.
Despite global opposition and protests, Trump on Wednesday fulfilled one of his major campaign promises by recognizing Jerusalem as the capital city of Israel, and demanded the State Department to develop a plan to move the U.S. embassy from Tel Aviv to Jerusalem.
Experts argued that Trump's decision, a bold step that could change the status quo in a highly sensitive region, is likely to draw rage and revenge, and more importantly, dampen the peace prospect in the Middle East.
The announcement has already triggered violent clashes between Israeli security forces and Palestinians in the West Bank, Gaza Strip and East Jerusalem in the past days.
Times Square-42nd Street/Port Authority Bus Terminal is the city's busiest station complex in the Metropolitan Transportation Authority system. More than ten trains lines use the location and it served 64.5 million passengers in 2016.
"When you hear about a bomb in the subway station, it is in many ways one of our worst nightmares. The reality turns out to be better than the initial expectation and fear," said New York State Governor Andrew Cuomo.