TIMELINE
Oct 5, 2011
A total of 13 Chinese sailors aboard two cargo ships, the Hua Ping and Yu Xing 8, are killed on the Mekong River.
Oct 13
Victims' families arrive in Thailand.
Oct 14
Chinese officials and families pay their last respects to victims at a farewell ceremony in Thailand.
Oct 23
A Chinese police delegation arrives in Thailand.
Oct 26
Chinese police inspect the crime scene to help with investigations.
Oct 28
Nine Thai soldiers reportedly turn themselves in for attacking the Chinese ships.
Oct 29
In a phone call with Thai Prime Minister Yingluck Shinawatra, Premier Wen Jiabao asks Thailand to arrest the suspects immediately.
Oct 31
China, Laos, Myanmar and Thailand agree to jointly patrol along the river at a meeting in Beijing.
Dec 10
The first joint patrol starts.
Jan 14, 2012
The four countries conduct the second joint patrol.
March 25
The third joint patrol starts.
April 25
Naw Kham, the drug lord suspected of masterminding the murder of the 13 Chinese sailors, is arrested in Laos.
May 10
Laos transfers Naw Kham to Chinese police.