A third person has been arrested in the Netherlands over suspected involvement in the Utrecht tram shooting Monday that left three people dead and five injured. The alleged shooter, 37-year-old Turkish national Gokmen Tanis, was captured and detained Monday evening after a city-wide manhunt that forced the closure of local schools and increased security at airports and mosques. Public prosecution office spokesman Ties Kortmann confirmed Tuesday that two other people are now in custody over suspected involvement. Tanis is being held on suspicion of manslaughter with a possible terrorist motive, but Kortmann stressed that investigations into his motive are ongoing. Dutch media, citing the suspect’s neighbors in Utrecht, have speculated that the shooting may have been linked to a relationship. The threat level in Utrecht has now been reduced.