beirut booby-trapped motorbike explode northeastern syrian city qamishli monday kill child wound six people monitor group syrian observatory human right report syrian state tv say motorbike explode report four people wound immediately mention deaths qamishli area mostly control kurdish security force bomb blast often claim islamic state occur qamishli nearby hasaka city kurdish control rare last year islamic state also report bomb via online amaq news agency say target vehicle belong kurdish security force explicitly claim attack kurdish internal security force asayish statement blame syrian government-allied paramilitary group carry attack kurdish ypg militia spearhead u.s.-backed offensive drive islamic state jihadist group remain strongholds eastern syria include former de facto syrian capital raqqa ypg syrian government force mostly stay way six-year-old syrian conflict motorbike explosion syrian city kill child monitor say