  We present the ALICE results on the nuclear modification factor and elliptic
flow of electrons and muons from open heavy-flavour hadron decays at
mid-rapidity and forward rapidity in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ =
2.76 and 5.02 TeV for different centrality intervals. The results are compared
to model calculations that include interactions of heavy quarks with the
medium.
