Two recent attacks on tenants, one of them fatal, in condominiums have set off alarm bells about safety in these buildings and the kind of people employed to protect them.

In the early hours of Dec 26, a 23-year-old was stabbed in a condo in Bang Phli district of Samut Prakan.

A male tenant, identified as Natthachai Art-samart, 31, allegedly admitted to police he attacked the young woman with a knife as he tried to force his way into her room.

The killer said he intended to rape and steal from her, according to police.

On Jan 4, Montri Yaikrathok, 41, a head security guard, raped a woman inside her room in a condo in  Bang Kae district of Bangkok.

Checks confirmed he had been convicted of rape in his home province of Sa Kaeo in 2013 and was released from prison four years ago before landing a job as head of security at the condo.

The two attacks, which were only days apart, have raised concerns about condo security protection and the recruitment of guards, especially since one of the attackers was one.

Police said changes to how security guards are recruited and how they go about their work were needed.

Background checks to see if guards have criminal records are also necessary, and condos must thoroughly check a guard's personal history.

Female tenants living alone are strongly advised not to open their doors to strangers and immediately alert the office if they have safety fears.