The multiple launch rocket systems were spotted near the village of Novoamvrosiivske.
Monitors from the OSCE Special Monitoring Mission (SMM) to Ukraine have spotted four Grad multiple rocket launchers (MLRs) in the Russian-occupied areas of Donbas.
"In violation of withdrawal lines in a non-government-controlled area, on October 6, the SMM saw four multiple launch rocket systems (BM-21 Grad, 122mm) near Novoamvrosiivske (56km east of Donetsk)," the OSCE SMM said in an update on October 8 based on information received as of 19:30, October 7, 2018.
The SMM also observed weapons that could not be verified as withdrawn, as their storage did not comply with the criteria set out in the October 16, 2015 notification from the SMM to the signatories of the Package of Measures on effective monitoring and verification of the withdrawal of heavy weapons.
"At such sites in non-government-controlled areas of Donetsk region, the SMM saw six towed howitzers (2A65 Msta-B, 152mm) and five self-propelled howitzers (2S1 Gvozdika, 122mm). It also noted that two self-propelled howitzers (2S1) continued to be missing," the update said.
"The SMM revisited permanent storage sites in non-government-controlled areas of Donetsk region whose locations were beyond the respective withdrawal lines and noted that 18 tanks (eight T-64 and ten T-72), nine mortars (2B14 Podnos, 82mm) and 15 anti-tank guns (MT-12) continued to be missing," the monitors said.