Road blockades made by tribesmen caused the killing of eight persons and wounding of 17 others across Yemen in October.
Blockades targeted gas, oil and goods trucks that were sometimes seized for several days.
According to the state news agency, Saba, more than 130 road blockades occurred in different Yemeni governorates in October, pointing out that attempts of security forces to remove such blockades led to the killing of eight persons and wounding more others.
Some tribes try to put pressures on the government through blockading roads, particularly after the eruption of Yemen's uprising in 2011.
Killings and other criminal acts have remarkably increased in some governorates due to revenge and armed disputes as armed men exploited insecurity in Sana'a to carry out killings and tribal revenge.
Major cities witnessed a state of loose security following the ouster of the former president Ali Abdullah Saleh who some of his relatives still run military services.
The Interior Ministry has declared a ban on weapons carrying inside cities, but armed men are still seen roaming with AK-47 assault rifles, hunting rifles and pistols inside Sana'a streets.
Yemeni political sides exchange accusations about inflaming instability and tensions in light of divisions among military units.
Yemeni politicians always demand to end the division of the military, stressing that the division endangers the political settlement.
High ranking officials including party leaders, ministers and military commanders were subjected to assassination attempts during the past months.
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