Tenho certeza de que você está pensando em A Hora Mais Negra .
Não pedaços do sol, mas algum tipo de raça alienígena invadindo a terra.
Young entrepreneurs Sean (Emile Hirsch) and Ben (Max Minghella) meet stranded travelers Natalie (Olivia Thirlby) and Anne (Rachael Taylor) at a hot Moscow nightclub. Their whole world changes in an instant when an alien attack devastates the city and everything goes dark. Joined by a Swedish businessman (Joel Kinnaman), the youths emerge from hiding days later and must somehow fight back against a nearly invisible enemy that could find and disintegrate them at any moment.
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No trailer, você pode ver o policial tocando a luz com o cassetete e virando poeira, como OP disse (são 40 segundos):