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We prove strong unique continuation property for the differential inequality$|(\partial_t +\Delta)u(x,t)|\le V(x,t)|u(x,t)|$ with $V$ contained in weakspaces. In particular, we establish the strong unique continuation property for$V\in L^\infty_t L^{d/2,\infty}_x$, which has been left open since the works ofEscauriaza [6] and Escauriaza-Vega [8]. Our results are consequences of theCarleman estimates for the heat operator in the Lorentz spaces.

Unique continuation for the heat operator with potentials in weak spaces