  We study the action of the BMS group in critical, bosonic string theory
living on a target space of the form $\mathbb{M}^{d}\times C$. Here $M^{d}$ is
$d$-dimensional (asymptotically) flat spacetime and $C$ is an arbitrary
compactification. We provide a treatment of generalized Ward--Takahashi
identities and derive consistent boundary conditions for any $d$ from string
theory considerations. Finally, we derive BMS transformations in higher
dimensional spacetimes and show that the generalized Ward--Takahashi identity
of BMS produces Weinberg's soft theorem in string theory.
