Police said four people had seen shot but there was “no ongoing threat”, without clarifying the condition of the gunshot victims.

Police tweeted officers were “responding to a shooting… in which two people were shot outside of National park,” in the Navy Yard neighborhood of southern Washington, DC.

Shortly after, it tweeted that “two additional victims associated with this incident walked into area hospitals for treatment for gunshot wounds.

“This is currently an active investigation and it appears there is no ongoing threat at this time,” it added.

Two AFP journalists who were at the game said some spectators had rushed for the exits after the gunshots, while others remained in their seats at the announcer’s initial urging.

Players rushed off the field and the game was halted after what sounded like a dozen or more shots were from outside the stadium.

The lights of multiple police cars lit up the street and sirens could be heard, as the crowd attending the game between the Washington Nationals and San Diego Padres was then asked to leave the stadium.

The United States has already said it will send the FBI and other agents to Port-au-Prince, two days after Moise was brutally killed by gunmen in his home, opening up a power vacuum in the impoverished and crisis-hit Caribbean nation.

In the wake of the slaying “we thought that mercenaries could destroy some infrastructure to create chaos in the country. During a conversation with the US Secretary of State and the UN we made this request,” elections minister Mathias Pierre told AFP.

The US State Department and pentagon both confirmed receiving a request for “security and investigative assistance” and said officials remain in contact with Port-au-Prince, but did not specify whether military troops would be deployed.

Washington has signaled its willingness to help the Haitian investigation, and White House spokeswoman Jen Psaki added Friday that senior FBI and other officials would be heading to the Caribbean as soon as possible.

Pierre confirmed that the request had been made as questions swirled Friday about who could have masterminded the audacious assassination, with most members of a hit squad of Colombians and Americans either dead or in custody, and no clear motive made public.