During searches by emergency services, the body of a lifeless man was found in an apartment near the location of the explosion.
Palestinian media reports claim that five people were killed in the strike on the Nur Shams camp.
Security sources say some of the arms are bound for the neighboring West Bank, adding that they have arrested several Jordanians linked to Palestinian militants.
Most of the clandestine flow of arms into the country has been bound for the neighboring West Bank, Jordanian officials say.
Police suspect the case, which left a 20-year-old woman dead and a young girl critically injured, may be an assassination attempt on an individual known to the police.
Two different explosive devices were detonated at the checkpoint on Saturday evening, according to the Iraqi Security Media Cell.
One person is reported dead according to a Syrian human rights organization based in the UK.
A huge blast hit an Iraqi military base used by Popular Mobilization Forces near Baghdad.
The IDF is still reviewing what caused the explosion, but did not say anything about any active threat or attack posed by Hezbollah.
Last month, there was another mysterious explosion in Russia, in St Petersburg.