Forces allied to former Yemeni President Ali Abdullah Saleh are approaching the city of Aden, sources on the ground told Al Arabiya News Channel on Monday. Shiite Houthi militias had joined forces with the loyalists of Saleh in a bid to take control of Yemen in recent months. The forces reached 30 kilometers away from Aden as a brigade allied to Houthi rebels shelled civilian residences in al-Dalea governorate hours after similar attacks resulted in civilian casualties, according to health officials. Sources said scores fled their homes in al-Dalea, as clashes continued in the al-Jalila area between locals and Houthis. Meanwhile in Yemen's southern Shabwa province, tribes on Sunday launched attacks on Houthi rebels and forces allied to Saleh, killing around 50 members of the militia. Saudi Arabia is leading a 10-state coalition to combat the Houthi's advancement of Yemen in support of the country's legitimate President Abdrabbu Mansour Hadi and his government.