Sheriff's deputies, firefighters and a bomb squad were sent to a home in Indian River County Monday following the discovery of a suspicious substance.
It was found outside the residence in the 1300 block of 26th Ave. SW.
Officials say the substance is similar to a Molotov cocktail.
Deputies said they took two people into custody under the Baker Act.
ATF and the St. Lucie County Bomb Squad are analyzing material taken from the home, the sheriff's office said.