The Latest on Syria's conflict (all times local):

2:10 p.m.

An official says at least three rockets fired from Syria have landed on the Turkish side of the border, killing one person and injuring another.

The mayor of the border city of Kilis, Hasan Kara, said one of the rockets hit a populated neighborhood causing the casualties and widespread panic. Two other rockets exploded on empty land.

The state-run Anadolu Agency said one of the rockets landed in an area close to a hospital.

It was not immediately clear who fired the rockets or whether Turkey's military has fired back in response.

The Turkish military has been retaliating to any rockets or shells fired from Syria that land on Turkish territory.

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11:20 a.m.

The U.N. envoy for Syria will begin holding "substantive" talks between the Syrian government and the opposition no later than Monday.

A spokeswoman for Staffan de Mistura says the talks will officially start on Wednesday but logistics and other issues mean that delegations are likely to arrive in Geneva over several days.

Spokeswoman Jessy Chahine specified the timetable on Tuesday, amid media reports giving various dates for the start of the talks.

The last attempt at peace talks collapsed within days in early February over a Russian-backed government offensive near the northern city of Aleppo. A U.S. and Russian-brokered cease-fire that began late last month has significantly reduced the violence.

Chahine says a task force focused on humanitarian aid and ceasing hostilities would meet Wednesday.