Authorities in Boston said they are investigating two apparent BB gun shootings that shattered windows on an MBTA bus on Saturday night and hit a female victim in the face on Sunday afternoon. Both incidents took place in the same area of Roslindale, but police said in a statement that they have not determined whether the reported shootings are related. On Saturday at about 9:35 p.m., two front passenger windows on a T bus were shattered after being shot by what Transit Police said they believe was an air-powered BB gun. No injuries were reported. The driver of the Route 35 bus told officers the windows shattered as the bus traveled inbound on Washington Street near Archdale Road, police said. The driver said he had seen two people standing in a driveway holding what looked like a gun. On Sunday at about 1:45 p.m., a female victim in that same area told Transit Police she was struck in the face by a projectile, possibly a BB pellet. Boston Police are also investigating that incident, the statement said.