Fighters of the UN-backed Government of National Accord (GNA) observe Libyan National Army (LNA) positions in Salah Al-Din frontline in Tripoli, Libya, on April 27, 2020. (Photos: Xinhua)

A fighter of the UN-backed Government of National Accord (GNA) reloads his machine gun in Salah Al-Din frontline in Tripoli, Libya, on April 27, 2020.

A fighter of the UN-backed Government of National Accord (GNA) passes though a hole in a wall in Salah Al-Din frontline in Tripoli, Libya, on April 27, 2020.

A fighter of the UN-backed Government of National Accord (GNA) takes cover in Salah Al-Din frontline in Tripoli, Libya, on April 27, 2020.